You can use Niagara effects in real time with the Cinematic. You can start, speed up or slow down the Niagara effects at any time with the sequencer.
https://dev.epicgames.com/community/learning/tutorials/9Gwd/unreal-engine-niagara-sim-caching-plugin-you-can-use-niagara-effects-in-real-time-with-the-cinematic-sub