Controller scripting interface for Repository Catogory

Switching to the newest qt-unified installer (3.1.0) I realized, that our automation script does not work anymore, because of the the introduction of Repository Categories on the Component Selection Page. We use Qt 5.9.x, which is in the Archive repo, so the call

gui.currentPageWidget().selectComponent("qt.596.gcc_64");

does not select anything.

For the scripting interface to work properly, one should be able to select a repo category, refresh and then select a package.

I did not find anything in the documentation, nor in the source, which would make this possible.