I saw this article today which might interest OP:
http://www.dualshockers.com/2016/09/09/nes-snes-mega-drive-and-gameboy-emulator-to-be-released-on-xbox-one/
This seems like something that Microsoft would not allow, but I just looked over Microsoft's UWP developer agreement. They don't appear to explicitly forbid emulators. But it seems very likely that the author of the software mentioned in the article is probably using other people's code without permission and violating some emulator license agreements. Microsoft has a provision in their agreement where apps must adhere to the terms of any FOSS code they're using.
Regarding the original question... Keep in mind that UWP can't use any of the existing user interface. Someone would need to write a brand new user interface to work with UWP. "Probably not" is a great answer, because it probably won't happen. Could some pieces of BizHawk be used to create another emulator? Yes, about 4 years ago I attempted to port BizHawk
to the PSVita via the now discountinued PS Mobile. That was prior to the introduction of most of the native 3rd party cores / DLLs mentioned by hegyak above. So for an honest answer, some consoles like GameGear may be adaptable, but the majority won't be. And you probably won't find anyone willing to spend the effort on it, because it's been 4 years and we haven't found anyone to help with a Linux port and I'm the only one who touches the macOS port and even that doesn't get improved much.