This is a proof-of-concept of using WinUI 3 without MSBuild, and with minimal XAML.
app.xaml is required; window xaml files are avoided as they are impractical
to use without the XAML compiler, which is not currently available outside of
MSBuild.
skynet-core/cmake-cpp-winrt-winui3
A work in progress attempt at using CMake with cpp/winrt and WinUI 3
C++