Never used nvUltra as it’s in private beta. I’m curious how accurate the list is, it surely is helpful if it’s accurate. “Similar note” is such a subjective thing though; Evernote tried to do this with the help of AI, and yet it doesn’t seem to be that useful (at least I never heard many people rave about it). For example: https://www.reddit.com/r/Evernote/comments/dofliz/evernotes_ai_related_notes/
Last thought: might belong to plugin ideas rather than feature request.