How to set Azure App Service Stack and Platform via ARM template?

I want to set Azure's App Service Platform and Stack settings with ARM template. What should be added to ARM template to set those values?

I want to be able to set .NET version to .NET Core 3.1 and Platform to x64 or x32.

Solution

In the siteConfig block within properties, add the following:

      "metadata": [ 
        { 
          "name": "CURRENT_STACK",
          "value": "dotnetcore" 
        } 
      ],
      "use32BitWorkerProcess": false,