Is your feature request related to a problem? Please describe.
I was perusing the issues with tag linux-native and one of them was about themes in both GNOME and KDE environments.

Describe the solution you'd like
Lazarus can compile to GTK2 and QT5. It can even compile to QT6 with a bit of effort to install the libqt6pas from a GitHub repo I now forget.

But, by installing the libqt5pas package, one is able to switch to compile for QT5.
It's just a matter of adding one more step in your CI/CD pipeline.

This would fix some of the issues with themes, I think. And besides, having an official distributions for both GTK2 and QT5 would be nice for the users.