Marks Lost after downloading a music album (video)

[keyboard]

Hello,
On the internet sometimes I find a nice music album, classics or some vocal songs. (All in mp4 format)
When it starts to play, on the line where the pointer moves, (most of the time) there are marks, if I point on the mark with the mouse, there is the name what is playing.
If I download that album to the computer and play it, those marks are gone.
I even dragged the downloaded file into the browser (Google Chrome), it is playing but without those marks.
Is it possible to keep those marks while / after downloading?
Answers will be appreciated.
Thanks
Motim

System win 10 pro, 20H2 x 64

[[ss]vegeta]

Hello,
On the internet sometimes I find a nice music album, classics or some vocal songs. (All in mp4 format)
When it starts to play, on the line where the pointer moves, (most of the time) there are marks, if I point on the mark with the mouse, there is the name what is playing.
If I download that album to the computer and play it, those marks are gone.
I even dragged the downloaded file into the browser (Google Chrome), it is playing but without those marks.
Is it possible to keep those marks while / after downloading?
Answers will be appreciated.
Thanks
Motim

System win 10 pro, 20H2 x 64

Those are chapters or something, probably made with javascript, or something.
I wouldn't believe there's a way to get them automatically, you probably have to find some manual way.
Post a link.

[Sviests]

I've never seen an output file where metadata was kept. I think they're only added in the html/js player by hand.
But if there are just few markings it's very easy to re-add them manually with FFMPEG, f.e.