Generate table of contents for (long?) notes

Is your feature request related to a problem? Please describe.
When I have long notes, I can't see all chapters, and can't get an overview of it.

Describe the solution you'd like
If the note is longer than the viewport (or maybe 2 times the viewport, if you can compute it), provide a menu-button that will drop-down as a table of contents.
It could be on left or right, I let UX engineers do their work :)

If detecting viewport length is too much, that could be a setting : Show Table of Contents in Notes Yes/No. My guess is that people who need it for long notes will not mind seeing them also in short notes.

Describe alternatives you've considered
I could make notes shorter, but that would mean multiply notes, and managing data density at notes level. With only categories, it's a bit of a pain, and for some topics, it does not make sense to split.

Additional context

Example extracted from Wikipedia:
Closed:

Expanded:

No file, test, or entry point is named. Start by locating the notes editor and its Markdown heading or rendering path, then clarify the viewport-versus-setting behavior with maintainers. Done means long notes expose a usable table of contents menu, matching the closed and expanded examples.