I don't know one single game which uses UE4 and runs in 60fps or even stabile 30fps on Switch. Abzu, Snake Pass, Octopath Traveler had bad and countless framerate droppings, Rime was almost unplayable. So.... no. If Nintendo don't get their Yoshi game run in constant 60fps at 576p, I think it's almost impossible to use this engine properly on Switch.
Hellblade and Octopath meet their 30fps target almost permanently on Switch, according to DF's testing.
Bet with Liquidlaser: I say PS5 and Xbox Series will sell more than 56 million combined by the end of 2023.