Environment by Epic Games
It's far from being perfect, as it uses desaturated version of underlying materials in order to blend in the light. I will update this post once a workaround emerges.
What it's good for: Speed prototyping, Potential theme exploration for a scene.
What it's NOT good for: Standard game production. It projects on top of everything including dynamic objects, weapons, characters etc.
Switch material domain to post-process and copy-paste the nodes: