I don't know if it's been discussed or suggested before (I tried to find something...), but has Kagi ever considered to create or integrate with note-taking, so that when you search for something in Kagi, your own notes/research is included in the results?
I also don't have a clear picture of what would be the best approach. Like, should Kagi implement a custom note-taking feature? Or should it act as a "server" for existing note-taking apps?
I'm sure there would be a lot of things to consider...
User searches for something in Kagi.
In the results, if something is found in the user's private knowledge-base (notes, research, zettelkasten, GTD, or whatever), it's shown inside the search results.
Such entries in the results should have some highlighting to indicate that this is a "private result".