Hello,

Currently chapters are supported in description. It will highlight 
currently played chapter and you can click to move to another one.

https://i.ibb.co/gvtKNSB/image.png

The main problem of this layout is you have to scroll to see and 
interact with chapters. You can’t see both at the same time, and it’s 
painful to go back and forth (even more when the description is long, as 
chapters are often at the end of it).

Piped has an amazing UI where chapters are directly visible if you watch 
the video without full screen. On desktop, it’s located at the right of 
the video and on mobile, just below the video.

https://i.ibb.co/MMm3wkb/image.png

https://i.ibb.co/k54M7cL/image.png

I would love to have a similar UI on CloudTube.

Excellent idea! I've experienced this frustration a little bit myself
as well. I added this to a todo so that nobody forgets about it:
https://todo.sr.ht/~cadence/tube/56

Feel free to keep discussing this in the todo thread or on matrix.