If you are already using qt, gtk or wx, then dear imgui is not really aimed at you. The intended use case is more the situation where you already have what you

If you are already using qt, gtk or wx, then dear imgui is not really aimed at you. The intended use case is more the situation where you already have what you term the backend, and you want to add a gui to your program. (There's not much that's platform-specific in dear imgui, so you end up with a GUI that's as multiplatform as your program is.)