OpenXml SDK PowerPoint Sunburst chart

Question

The Sunburst chart type was introduced in Office 2016 / 365, along with some other new chart types. I'm trying to work with the chart type in PowerPoint, but it can also be created in Excel, for example. (Excel provides the charting engine for all Office applications.)

Sunburst seems to be stored differently from other charts, the Productivity Tool doesn't seem to detect it normally and there seems to be an image representation of the chart instead of the actual chart data itself. The Productivity Tool shows no XML and the reflected code resembles the below

// Generates content of extendedPart1.
private void GenerateExtendedPart1Content(ExtendedPart extendedPart1)
{
    System.IO.Stream data = GetBinaryDataStream(extendedPart1Data);
    extendedPart1.FeedData(data);
    data.Close();
}

which streams in binary information, for example

    #region Binary Data
    private string partData = "UEsDBBQABgAIAAAAIQBi7p1oXgEAAJAEAAATAAgCW0NvbnRlbnRfVHlwZXNdLnhtbCCiBAIooAACAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACslMtOwzAQRfdI/EPkLUrcskAINe2CxxIqUT7AxJPGqmNbnmlp/56J+xBCoRVqN7ESz9x7MvHNaLJubbaCiMa7UgyLgcjAVV4bNy/Fx+wlvxcZknJaWe+gFBtAMRlfX41mmwCYcbfDUjRE4UFKrBpoFRY+gOOd2sdWEd/GuQyqWqg5yNvB4E5W3hE4yqnTEOPRE9RqaSl7XvPjLUkEiyJ73BZ2XqVQIVhTKWJSuXL6l0u+cyi4M9VgYwLeMIaQvQ7dzt8Gu743Hk00GrKpivSqWsaQayu/fFx8er8ojov0UPq6NhVoXy1bnkCBIYLS2ABQa4u0Fq0ybs99xD8Vo0zL8MIg3fsl4RMcxN8bZLqej5BkThgibSzgpceeRE85NyqCfqfIybg4wE/tYxx8bqbRB+QERfj/FPYR6brzwEIQycAhJH2H7eDI6Tt77NDlW4Pu8ZbpfzL+BgAA//8DAFBLAwQUAAYACAAAACEAtVUwI/QAAABMAgAACwAIAl9yZWxzLy5yZWxzIKIEAiigAAIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAKySTU/DMAyG70j8h8j31d2QEEJLd0FIuyFUfoBJ3A+1jaMkG92/JxwQVBqDA0d/vX78ytvdPI3qyCH24jSsixIUOyO2d62Gl/pxdQcqJnKWRnGs4cQRdtX11faZR0p5KHa9jyqruKihS8nfI0bT8USxEM8uVxoJE6UchhY9mYFaxk1Z3mL4rgHVQlPtrYawtzeg6pPPm3/XlqbpDT+IOUzs0pkVyHNiZ9mufMhsIfX5GlVTaDlpsGKecjoieV9kbMDzRJu/E/18LU6cyFIiNBL4Ms9HxyWg9X9atDTxy515xDcJw6vI8MmCix+o3gEAAP//AwBQSwMEFAAGAAgAAAAhAOgRAAEYAwAANAcAAA8AAAB4bC93b3JrYm9vay54bWysVV1vmzwUvp/0/gfkexebrwAqmUIArdI6TWvXXU4umMYqYGRMk67af98xCem6TlO0vVFi5/gcP+c5HxzO3+7axnrgahCySxA9I8jiXSkr0d0l6PN1gUNkDZp1FWtkxxP0yAf0dvnfm/OtVPe3Ut5bANANCdpo3ce2PZQb3rLhTPa8A00tVcs0iOrOHnrFWTVsONdtYzuEBHbLRIf2CLE6BUPWtSh5Jsux5Z3egyjeMA30h43ohxmtLU+Ba5m6H3tcyrYHiFvRCP04gSKrLeOLu04qdttA2DvqWzsF3wB+lMDizJ5A9cpVK0olB1nrM4C296RfxU+JTemLFOxe5+A0JM9W/EGYGh5ZqeAvWQVHrOAZjJJ/RqPQWlOvxJC8v0Tzj9wctDyvRcNv9q1rsb7/wFpTqQZZDRt0XgnNqwQtQJRb/uJAjX06iga0juOTENnLYzt/VFbFazY2+hoaeYaHJyMIIsc3ljsVz8n+qJUF/y+y9+Dwij2AewiyOnTnBeBT8rUrVUwJIV+fVmEY0CxMceHmIfYWKw+vojzDYUo9d12s8oiS75AkFcSlZKPeHIIz6Any/N+oLtlu1lASj6J6ZvIEPqcPNusvy6z7biIyj/GN4NvhOQ1GtHZfRFfJbYL8BYG4HmfRBWE7qb6ISm9MlBRyczh7x8XdBvi6rrkEtTa0EvTkkNQtfIfixaJwsEcyB0e+s8JBnnoLPwvp2okmOvZPfKZpAbym3eqmCl+ZCUJhLJl9SjKyVGx8qIuKmoDs+VrJmhIqarbJEBLsRMZCNvxKfONQvTpBq+kS3+n3g16ew26NSgBj6pHVgkQeJrnrYy+MHBx6roPXXubk/iLP8tQ39TIDMP4/xgA0F/XjebIa4hum9LVi5T3M40+8TtkAPbaPEXj+TDb1w5S4QNEraIE9GhGcpoGH/axw/QXN1rlfPJM1GYHIfxnapw2b0J5uc6ZHBW8DID3JsVmLw+nxsN4fHEr3wkH8KZuep/3tPxleQfQNP9G4uDnRcP3h8vpyapffBmBPCTbr1Bb2XJblDwAAAP//AwBQSwMEFAAGAAgAAAAhAIE+lJfzAAAAugIAABoACAF4bC9fcmVscy93b3JrYm9vay54bWwucmVscyCiBAEooAABAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAKxSTUvEMBC9C/6HMHebdhUR2XQvIuxV6w8IybQp2yYhM3703xsqul1Y1ksvA2+Gee/Nx3b3NQ7iAxP1wSuoihIEehNs7zsFb83zzQMIYu2tHoJHBRMS7Orrq+0LDppzE7k+ksgsnhQ45vgoJRmHo6YiRPS50oY0as4wdTJqc9Adyk1Z3su05ID6hFPsrYK0t7cgmilm5f+5Q9v2Bp+CeR/R8xkJSTwNeQDR6NQhK/jBRfYI8rz8Zk15zmvBo/oM5RyrSx6qNT18hnQgh8hHH38pknPlopm7Ve/hdEL7yim/2/Isy/TvZuTJx9XfAAAA//8DAFBLAwQUAAYACAAAACEA++YwKnYDAADGDQAAGAAAAHhsL3dvcmtzaGVldHMvc2hlZXQxLnhtbJyXXY+iMBSG7zfZ/0C4VygifkSdqIzZudhks1/3FYuSAUra6sxks/99TyFCW5YJTDImg+/p24eentO6enjNUutGGE9ovrbR2LUtkkf0lOTntf3r52E0ty0ucH7CKc3J2n4j3H7YfP60eqHsmV8IERY45HxtX4Qolo7DowvJMB/TguSgxJRlWMAjOzu8YASfykFZ6niuGzgZTnK7cliyPh40jpOIhDS6ZiQXlQkjKRbAzy9Jwe9uWdTHLsPs+VqMIpoVYHFM0kS8laa2lUXLp3NOGT6m8N6vyMeR9crgz4PP5D5N+X1rpiyJGOU0FmNwdirm9usvnIWDo9qp/f69bJDvMHJLZAIbK+9jSGhae3mN2eSDZkFtJpeLLa/JaW3/QYfD4wLtgtEuDLyRjx790c7z5iM3mB7C3WQaHLazv/ZmdUogw/KtLEbitb1FyxDNbGezKjfQ74S8cOV/S+DjD5KSSBCYBNmW3J9HSp9l4BN85cqhTmvsodyf35h1IjG+puI7fflCkvNFgIk/9qYALjO/PL2FhEew5cBp7E9rjhALvFkx+mJB+mBaXmBZDGjpd43crCIZG0IwmHF409vGXTk3oIvgA1a1H+Sgt98Wgms/VPuVc+1UzdO1vapNdC30SjqvGaLhQVb740FwJ56qmXiq5ht4kxIPdeBBBvrjQXAnnqqZeKo2NfD8Cm/+/+TC1uqPB8GdeKoWGMlVtZmBNy3x5s3XWnKDIXgQ3ImnaiaeqjXLVNVHUOF1rN5sCB4Ed+Kp2sJYoVmVwI4Vkidj32rfQnAngqY1raBahnnF0Gx9LUuLIQwQ3DCYLUITzV2uiWaTWFRNotn9GiGCG0X/ZZLR3Yy6anYDUGUvRc0m00GGdOctUtszMhdLV4263+uqsedDUCWm15FRNKjpy+h31ktTW5iaanYHcJaY86Ym9NUc1PyR1v2NSt/pqlGEe031zPIA9d2kDzoEkHYKtDA1tYWpnRLGhgnBucTsWs1BhwHSToMWpqoqR3fZTvbaWM8sZVDLpHeV0KBDAWmnQgtTVduYmtqq9OpsUPD1vTnocIBLpVJCLUxV9cwTHsaWtdykuwKp7pnV3bDAZ/IVs3OScyslcXmBBFNWXTLdsZyAFvJaOYPMHakQNLs/XeD3EoHLojuGAoopFfcHeZetf4Ft/gEAAP//AwBQSwMEFAAGAAgAAAAhAMEXEL5OBwAAxiAAABMAAAB4bC90aGVtZS90aGVtZTEueG1s7FnNixs3FL8X+j8Mc3f8NeOPJd7gz2yT3SRknZQctbbsUVYzMpK8GxMCJTn1UiikpZdCbz2U0kADDb30jwkktOkf0SfN2COt5SSbbEpadg2LR/69p6f3nn5683Tx0r2YekeYC8KSll++UPI9nIzYmCTTln9rOCg0fE9IlIwRZQlu+Qss/Evbn35yEW3JCMfYA/lEbKGWH0k52yoWxQiGkbjAZjiB3yaMx0jCI58Wxxwdg96YFiulUq0YI5L4XoJiUHt9MiEj7A2VSn97qbxP4TGRQg2MKN9XqrElobHjw7JCiIXoUu4dIdryYZ4xOx7ie9L3KBISfmj5Jf3nF7cvFtFWJkTlBllDbqD/MrlMYHxY0XPy6cFq0iAIg1p7pV8DqFzH9ev9Wr+20qcBaDSClaa22DrrlW6QYQ1Q+tWhu1fvVcsW3tBfXbO5HaqPhdegVH+whh8MuuBFC69BKT5cw4edZqdn69egFF9bw9dL7V5Qt/RrUERJcriGLoW1ane52hVkwuiOE94Mg0G9kinPUZANq+xSU0xYIjflWozuMj4AgAJSJEniycUMT9AIsriLKDngxNsl0wgSb4YSJmC4VCkNSlX4rz6B/qYjirYwMqSVXWCJWBtS9nhixMlMtvwroNU3IC+ePXv+8Onzh789f/To+cNfsrm1KktuByVTU+7Vj1///f0X3l+//vDq8Tfp1CfxwsS//PnLl7//8Tr1sOLcFS++ffLy6ZMX333150+PHdrbHB2Y8CGJsfCu4WPvJothgQ778QE/ncQwQsSSQBHodqjuy8gCXlsg6sJ1sO3C2xxYxgW8PL9r2bof8bkkjpmvRrEF3GOMdhh3OuCqmsvw8HCeTN2T87mJu4nQkWvuLkqsAPfnM6BX4lLZjbBl5g2KEommOMHSU7+xQ4wdq7tDiOXXPTLiTLCJ9O4Qr4OI0yVDcmAlUi60Q2KIy8JlIITa8s3eba/DqGvVPXxkI2FbIOowfoip5cbLaC5R7FI5RDE1Hb6LZOQycn/BRyauLyREeoop8/pjLIRL5jqH9RpBvwoM4w77Hl3ENpJLcujSuYsYM5E9dtiNUDxz2kySyMR+Jg4hRZF3g0kXfI/ZO0Q9QxxQsjHctwm2wv1mIrgF5GqalCeI+mXOHbG8jJm9Hxd0grCLZdo8tti1zYkzOzrzqZXauxhTdIzGGHu3PnNY0GEzy+e50VciYJUd7EqsK8jOVfWcYAFlkqpr1ilylwgrZffxlG2wZ29xgngWKIkR36T5GkTdSl045ZxUep2ODk3gNQLlH+SL0ynXBegwkru/SeuNCFlnl3oW7nxdcCt+b7PHYF/ePe2+BBl8ahkg9rf2zRBRa4I8YYYICgwX3YKIFf5cRJ2rWmzulJvYmzYPAxRGVr0Tk+SNxc+Jsif8d8oedwFzBgWPW/H7lDqbKGXnRIGzCfcfLGt6aJ7cwHCSrHPWeVVzXtX4//uqZtNePq9lzmuZ81rG9fb1QWqZvHyByibv8uieT7yx5TMhlO7LBcW7Qnd9BLzRjAcwqNtRuie5agHOIviaNZgs3JQjLeNxJj8nMtqP0AxaQ2XdwJyKTPVUeDMmoGOkh3UrFZ/QrftO83iPjdNOZ7msupqpCwWS+XgpXI1Dl0qm6Fo9796t1Ot+6FR3WZcGKNnTGGFMZhtRdRhRXw5CFF5nhF7ZmVjRdFjRUOqXoVpGceUKMG0VFXjl9uBFveWHQdpBhmYclOdjFae0mbyMrgrOmUZ6kzOpmQFQYi8zII90U9m6cXlqdWmqvUWkLSOMdLONMNIwghfhLDvNlvtZxrqZh9QyT7liuRtyM+qNDxFrRSInuIEmJlPQxDtu+bVqCLcqIzRr+RPoGMPXeAa5I9RbF6JTuHYZSZ5u+HdhlhkXsodElDpck07KBjGRmHuUxC1fLX+VDTTRHKJtK1eAED5a45pAKx+bcRB0O8h4MsEjaYbdGFGeTh+B4VOucP6qxd8drCTZHMK9H42PvQM65zcRpFhYLysHjomAi4Ny6s0xgZuwFZHl+XfiYMpo17yK0jmUjiM6i1B2ophknsI1ia7M0U8rHxhP2ZrBoesuPJiqA/a9T903H9XKcwZp5memxSrq1HST6Yc75A2r8kPUsiqlbv1OLXKuay65DhLVeUq84dR9iwPBMC2fzDJNWbxOw4qzs1HbtDMsCAxP1Db4bXVGOD3xric/yJ3MWnVALOtKnfj6yty81WYHd4E8enB/OKdS6FBCb5cjKPrSG8iUNmCL3JNZjQjfvDknLf9+KWwH3UrYLZQaYb8QVINSoRG2q4V2GFbL/bBc6nUqD+BgkVFcDtPr+gFcYdBFdmmvx9cu7uPlLc2FEYuLTF/MF7Xh+uK+XNl8ce8RIJ37tcqgWW12aoVmtT0oBL1Oo9Ds1jqFXq1b7w163bDRHDzwvSMNDtrVblDrNwq1crdbCGolZX6jWagHlUo7qLcb/aD9ICtjYOUpfWS+APdqu7b/AQAA//8DAFBLAwQUAAYACAAAACEAeaGAbKQCAABSBgAADQAAAHhsL3N0eWxlcy54bWykVW1r2zAQ/j7YfxD67sp24ywJtsvS1FDoxqAd7Ktiy4moXowkZ87G/vtOdl4cOrbRfolO59Nzz91zUtKbTgq0Y8ZyrTIcXYUYMVXqiqtNhr8+FcEMI+uoqqjQimV4zyy+yd+/S63bC/a4ZcwhgFA2w1vnmgUhttwySe2VbpiCL7U2kjrYmg2xjWG0sv6QFCQOwymRlCs8ICxk+T8gkprntglKLRvq+JoL7vY9FkayXNxvlDZ0LYBqF01oibpoamLUmWOS3vsij+Sl0VbX7gpwia5rXrKXdOdkTmh5RgLk1yFFCQnji9o780qkCTFsx718OE9rrZxFpW6VAzGBqG/B4lnp76rwn7xziMpT+wPtqABPhEmellpogxxIB53rPYpKNkTcUsHXhvuwmkou9oM79o5e7UOc5NB77ySex2GxcIgLcWIVewLgyFOQzzGjCtigg/20byC9gkkbYPq4f0RvDN1HcTI6QPqEebrWpoLJPvfj6MpTwWoHRA3fbP3qdAO/a+0cqJ+nFacbrajwpQwgJwPKKZkQj376v9UX2F2NVCsL6e6rDMM98k04mlDIwRzwho3HH6MN2G+GRV19iQ+II9oXpE/pkdc7w5/9dRUwOQcItG65cFz9gTBgVt25BaFXwPmr1zfnlAU6UbGatsI9nT5m+Gx/YhVvZXyK+sJ32vUQGT7bD16paOpzsM49WBgvWFFreIZ/3i0/zFd3RRzMwuUsmFyzJJgny1WQTG6Xq1UxD+Pw9tfoAXjD9e/fqzyFi7WwAh4Jcyj2UOLj2Zfh0Wag388o0B5zn8fT8GMShUFxHUbBZEpnwWx6nQRFEsWr6WR5lxTJiHvyymciJFE0PDiefLJwXDLB1VGro0JjL4gE278UQY5KkPOfQf4bAAD//wMAUEsDBBQABgAIAAAAIQCdyM0K/AAAAOwCAAAUAAAAeGwvc2hhcmVkU3RyaW5ncy54bWx0ksFOwzAQRO9I/IPlO3Uc2lCQ40ogceJW+AAr2TaW4nXwOgj+npBeULM5+nk9OzOyOXyHXnxBIh+xlnpTSAHYxNbjuZYf7693eykoO2xdHxFq+QMkD/b2xhBlMb1FqmWX8/CkFDUdBEebOABON6eYgsvTMZ0VDQlcSx1ADr0qi6JSwXmUookj5lpud1KM6D9HeLmAspLWkLcm2yMkD6SNytaoP3TBz8lh04kFP2YIS/oG7rRCy2vlefb+ms66/OyWVdixtGLpw0q6xb7ZxcLb7HjPKj+yOXjHumAl9Fr3fEd8bs1Xp3kNviW9Yntl4z8RNf1W+wsAAP//AwBQSwMEFAAGAAgAAAAhAFTmubJBAQAAawIAABEACAFkb2NQcm9wcy9jb3JlLnhtbCCiBAEooAABAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAJSSX0vDMBTF3wW/Q8l7m7ZjU0LbgZM9ORCcKL6F5G4LNn9Iol2/vWm71ep88TE55/5yziXF8ijr6BOsE1qVKEtSFIFimgu1L9Hzdh3fosh5qjittYISteDQsrq+KpghTFt4tNqA9QJcFEjKEWZKdPDeEIwdO4CkLgkOFcSdtpL6cLR7bCh7p3vAeZousARPOfUUd8DYjER0QnI2Is2HrXsAZxhqkKC8w1mS4W+vByvdnwO9MnFK4Vs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Is it possibly to generate a Sunburst Chart in PowerPoint using OpenXML SDK in C#?

Answer 1

Adding charts to a presentation using Open XML SDK is very time consuming. If you were to use Aspose.Slides for .NET, you would add a Sunburst chart like this:

using var presentation = new Presentation();

// Add an empty Sunburst chart to the first slide.
var chart = presentation.Slides[0].Shapes.AddChart(ChartType.Sunburst, 20, 20, 500, 400);
chart.ChartData.Categories.Clear();
chart.ChartData.Series.Clear();

var wb = chart.ChartData.ChartDataWorkbook;
wb.Clear(0);

// Branch 1:
var leaf = chart.ChartData.Categories.Add(wb.GetCell(0, "C1", "Leaf1"));
leaf.GroupingLevels.SetGroupingItem(1, "Stem1");
leaf.GroupingLevels.SetGroupingItem(2, "Branch1");

chart.ChartData.Categories.Add(wb.GetCell(0, "C2", "Leaf2"));

leaf = chart.ChartData.Categories.Add(wb.GetCell(0, "C3", "Leaf3"));
leaf.GroupingLevels.SetGroupingItem(1, "Stem2");

chart.ChartData.Categories.Add(wb.GetCell(0, "C4", "Leaf4"));

// Branch 2:
leaf = chart.ChartData.Categories.Add(wb.GetCell(0, "C5", "Leaf5"));
leaf.GroupingLevels.SetGroupingItem(1, "Stem3");
leaf.GroupingLevels.SetGroupingItem(2, "Branch2");

chart.ChartData.Categories.Add(wb.GetCell(0, "C6", "Leaf6"));

leaf = chart.ChartData.Categories.Add(wb.GetCell(0, "C7", "Leaf7"));
leaf.GroupingLevels.SetGroupingItem(1, "Stem4");

chart.ChartData.Categories.Add(wb.GetCell(0, "C8", "Leaf8"));

var series = chart.ChartData.Series.Add(ChartType.Sunburst);
series.Labels.DefaultDataLabelFormat.ShowCategoryName = true;
series.DataPoints.AddDataPointForSunburstSeries(wb.GetCell(0, "D1", 4));
series.DataPoints.AddDataPointForSunburstSeries(wb.GetCell(0, "D2", 5));
series.DataPoints.AddDataPointForSunburstSeries(wb.GetCell(0, "D3", 3));
series.DataPoints.AddDataPointForSunburstSeries(wb.GetCell(0, "D4", 6));
series.DataPoints.AddDataPointForSunburstSeries(wb.GetCell(0, "D5", 9));
series.DataPoints.AddDataPointForSunburstSeries(wb.GetCell(0, "D6", 9));
series.DataPoints.AddDataPointForSunburstSeries(wb.GetCell(0, "D7", 4));
series.DataPoints.AddDataPointForSunburstSeries(wb.GetCell(0, "D8", 3));

presentation.Save("Sunburst.pptx", SaveFormat.Pptx);

Result:

This is a paid library, but you can get a temporary license to evaluate all features. I work as a Support Developer at Aspose.