this might be true at the moment but this is looking promising:
https://portal.productboard.com/epicgames/1-unreal-engine-public-roadmap/c/1197-desktop-renderer-on-mobile-devices?utm_medium=social&utm_source=portal_share
I’d expect it to be very limited for a few generations though, i don’t think most devices have the necessary hardware to fully support these very high quality features yet