Is it possible to rework genshin into using unreal engine?

I've been curious what genshin might have looked like if it were built using unreal engine. It would also be unavoidable that genshin would look outdated once hoyo and other gacha companies will release new games. And also now that we are near to its endgame, is it possible for the devs to make genshin chapter 2 in another game engine?