Thanks for the heads up, but doing it across Windows/UWP, Android and iOS requires a bit more of effort than what you described, hence Skia.Sharp instead.
I'm doing exactly that though. To compile for iOS for example, create a separate output directory with `target_os="ios" target_cpu="arm64"`. You can see a few more examples here https://skia.org/user/build
Unfortunately, C++ libraries are a bit harder to use than other languages, hopefully the modules proposal will make this a lot easier.