Qtcreator and flatpak

I see how flatpak-builder can replace the build process that qtcreator used to do for me.

But I’ll always need to edit .ui files and arrange window controls.

when i just sudo apt install qtcreator, I don’t see any qmake (or whatever it is that qt picks it’s runtime version from).

I apparently don’t need qtcreator for flatpak-builder to work. but where do I point my qt environment?? When I flatpak install org.kde.Sdk isn’t there some version of qt I can point qtcreator at?