Ability to add comments. For example I often use GoodNotes to take notes during meetings. Near the top I write the initials of the people attending the meeting - writing their full names would take up too much space. Sometimes there are multiple people with the same initials or I forget people’s full names if I don’t know them well.

I could add notes to each person’s initials and tap on them later to see the person’s full name.

Another option would be to allow a collapsible writing area.

Either that or