This is planed sometime this year according to the feedback snapshot here:
https://forums.flightsimulator.com/t/blog-may-13th-2021-development-update/401319
You may also up vote and contribute to this wishlist topic:
https://forums.flightsimulator.com/t/replay-function-missing/130915
This wishlist topic is for feature requests to be added to the replay if you want to up vote and contribute to:
https://forums.flightsimulator.com/t/wishlist-for-features-of-built-in-replay-functionality/390484
Closing this topic so that votes do not split.