Hi there. Apple Vision Pro is now (recently!) a valid build target for Unreal Engine - but you're going to want to use 5.4 from source and there are a few gotchas you'll have to mind. This quickstart guide should get you most of the way there - just remember to build 5.4 from source (which isn't documented in the guide):
https://dev.epicgames.com/community/learning/tutorials/1JWr/unreal-engine-apple-vision-pro-quick-start-guide