https://forum.snapcraft.io/search?q=unreal%20engine%205%20category%3A21 and https://snapcraft.io/search?q=unreal+engine return 0 results.
There is currently no standardized installation method for Unreal Engine 5. It’s just a .zip file.
Since it’s already massive and (considering its installation method) doesn’t currently depend upon many system libraries, this would be a time for snap to shine, because it’s exactly when a more standardized containerized installer is useful.