I'd like the ability to export the scene and characters into a game maker as it is without having to reconstruct it again. For example, Blender—I'd love to use its lighting engine, but rebuilding the scene is an undertaking.
I'm not saying I'd like to have the entire project animated in Unity as it does with After Effect, of course. Porting over what's in the scene would be enough, really.
Something like this is super complicated, so I understand if this is truly wishful thinking.