As a Wikipedia editor I want to be able to add selected page sections to my watchlist so that I don’t need to watch the whole article.
Further details: Helpful for e.g. notability or deletion discussions. Also helpful in case a whole section gets removed or in case of long articles where it's difficult to recognize fast which section was edited.
Effort:
Needs to be discussed with: WMF/Flow (might be done via Flow)
This is part of the Top 20 wishes of the German community.