I’ve really understood all this stuff when reading: corefx/net-platform-standard.md at master · dotnet/corefx. A must!
Quite a bit old but target “legacy” WPF Xaml instead of new one: SocialStream/XAMLConverter at master · stimulant/SocialStream
Include html/css converters able to produce Xaml. In fact, I was searching for the new HtmlBlock which is supposed to come to Windows App Studio june upgrade and more precisely in Windows App Studio Libraries. Of course, It’s only UWP, but it can be a great source of inspiration:).