I’m not entirely sure how useful my project would be to xtd in its current form.
We’re both using fluent, chainable styles. xtd relies on multiple backends (Qt5, GTK3, GTK4, FLTK, etc.), while my framework doesn't need to use a thirdparty backend and already supports Linux, FreeBSD, Windows, Android, iOS, macOS, and WebAssembly, its just a matter of building it for those platforms and fixing whtever bugs appear.
If you were to integrate my project into xtd, it would essentially mean placing xtd abstraction layer on top of my abstraction layer. It would likely make more sense to combine efforts directly and build a larger, unified project rather than layering one system on top of another.