As an end user, I know we could easily do that by joining two or three separate videos, like:
Intro.mp4 + episode_xx.mp4 + outro.mp4
But when it comes to batch processing, it seems we are currently lack of it. Imagine if it's for a TV show or series of tens or more episodes. It's definitely a horrible workload for any YouTubers/TikTokers.
TBH, I've tried to convince some other apps to implement this (e.g. see THIS LINK), but it seems they didn't see it worth enough to implement. While some others already support that (e.g. see THIS LINK).
Please understand our pain point here and consider adding this wonderful time-saving feature. Thank you!