How do we mention or tag someone in using Slack's Block Kit Builder?

Question

I tried creating slack's blcok kit builder, the desired design were actually fine. But I don't know where to find a button so we can tag a someone on it.

Someone knows how to do it? thanks

---

I have here an attempt to tag a person named john but unfortunately it just generated a plain text, it did not notify the person nor became the same the design as expected (see image result below) view playground

{
    "blocks": [
        {
            "type": "section",
            "text": {
                "type": "mrkdwn",
                "text": "@juan \n\nis a mrkdwn section block"
            }
        },
        .....
    ]
}

Here is the result

Answer 1

I found the solution from the following link.

https://api.slack.com/reference/surfaces/formatting#mentioning-users

1. get the user's id
2. wrap it with a left and right arrow with an "@" symbol beside it. syntax <@userId>

usage:

{
    "blocks": [
        {
            "type": "section",
            "text": {
                "type": "mrkdwn",
                "text": "Hey <@802AWTP13BZ>, thanks for submitting your report!"
            }
        }
    ]
}