It's not tangent at all. It's fully in!
The mentioning of DaVinci is into the link you posted here I didn't invented. So please or you send here a demo that what you are asking is working indeed for such purpose, or the one is spreading not correct information is you and not me.
So can you clarify?
Because to ask to a programmer as
@Exeldro the engagement to implement a feature that's NOT used (as instead erroneously declared into your docs), is not fair.
DaVinci (and so far even Premiére) doesn't use "chapters" to sync anything so far (it's up to you, after your free/false-allegations, to demonstrate the opposite).
Below the 2 screenshots related what I'm saying.
Hence I'm back to my original question and consideration.
SCREENSHOTS:
1. What you posted
2. What actually DaVinci uses for the sync.
View attachment 108675
What DaVinci uses to perform the Sync.
I don't see any "embedded chapters into the MP4" even into the MultiCam there is not any Chapter.
There are Markers, instead, that you need to add in DaVinci itself. Which is different story.
NOTE: the same is into Première.
It still the question: where are useful these embedded chapters? For which NLE?
View attachment 108676
View attachment 108679