This template makes the Windows App SDK (formerly known as Project Reunion) available to F# developers.
Since F# is a fully functional member of the .NET language family, it's already compatible with the SDK's nuget package.
XAML is not supported, yet, nor creating an UIElement other than a Button.
WinUI3 does not support writing UIs without a XAML compiler yet, and that is only available to C++ and C#. Everything else from the SDK 1.0 Stable version should work,
As WinUI is a large part of the Windows App SDK, one goal is to also support the latest WinUI app development.