I'm really happy that I can announce our own Matus Chochlik implemented TS Reflection in his fork of Clang. 

You can experiment with it at Compiler Explorer: https://compiler-explorer.com/z/TrYEYhqMK

And find source code here: https://github.com/matus-chochlik/llvm-project

Any feedback and bug report is welcome, I think Matus hopes for upstreaming it soon.

Thanks Matus for awesome work! ❤️

Hana