Great News: You can now export your Redshift Textures from Cinema4D to Unreal Engine 5.
All you need is the Cineware by Maxon Plugin inside Unreal.
Import your Cinema4D Setup with Datasmith and you are ready to go.
Redshift 2023 Spring Release
The new Redshift Release looks promising.
You have new functions like Backplates, Flakes, New PRG Sun & Sky model, and a Camera for Houdini.
You can download the Cineware Plugin for Unreal Engine here.