I’m asking for private notes, that only you as a user can see.

Just to exemplify, a similar feature is over at mastodon, where you click on profile and you see an “add note” message, another implementation is over at discord.

It is a really useful feature when needing to remember certain users, like when you are looking at why you blocked someone or for when you interact with certain recurring users.

Is there an extension or feature for this, if not, has it been requested on GitHub, or am I restricted to having to keep a manual list myself?