As a User I want clangd and others to be able to show Function Documentation for Qt Types while I'm writing code

Modern IDEs can display inline help for functions if the documentation is done right:

This is extremely convenient for the User. Qt should have something at least similar. While clangd doesn't currently correctly display doxygen like comments there is ongoing discussion about it here: https://github.com/clangd/clangd/issues/529

The VSCode C++ Extension seems to be able to do this better already.