The RTXGI Plugin allows for fast, high-quality ray traced global illumination. This powerful real-time tool utilizes ray-tracing to dynamically update lighting information on the fly, eliminating the need for lengthy pre-computation or baking.
https://dev.epicgames.com/community/learning/livestreams/pzx/real-world-examples-of-nvidia-s-rtx-global-illumination-and-direct-illumination-inside-unreal