setting up the project to use emcsripten kit

[Bean01]

I am using vscode (not vs community nor the qt creator).
I have a pro file and I am using qmake to generate the makefile.

I want to update the KDE qmlonline project to use qt6 but I am having issues setting up the project.
apparently I need to use clang to compile and select the emscripten kit but I dont know how to do that with a pro file.