Visual Studio 2019 create NuGet package that includes NetStandard and updates web.config

Question

Recently, I created a NuGet package in Visual Studio 2019 by following the steps here to create the package using the "Pack" command. The problem is when I tried to use the models from the Class Library in the package, I kept getting errors saying that I needed to add a reference to NetStandard (see Stackoverflow question here). I eventually determined that I had to install NetStandard from NuGet and then manually add the assembly to the web.config file in the application in which I was trying to use the NuGet package I created.

My question is, what do I need to do when creating the NuGet package to get it to add NetStandard (it automatically adds the other dependencies like Newtonsoft.Json), and have it update the web.config file so I do not have to tell my users they must manually update their web.config?

I assume there has to be a way to do this because when I install other NuGet packages, my web.config is often updated and all needed dependencies are added. I have been scouring the internet looking for answers, but I am not even sure how to search for what I need. (We all know typing in the correct search criteria is extremely important.)

I am hoping this all makes sense to someone who knows. I will continue trying to find answers online, but if you can help, please do so.