When I was writing my first fantasy novel I was messing around with Notion templates (almost a local wiki in a sense) just to organize weapons, factions/governments, religions, etc. It didn't work as well as I expected and I had been wishing something like your service existed the whole time. Well done!

For time being, I'll put together a little blog post about Notebook.ai to let the community know about it. I know there's writers out there that are looking for this exact product. I appreciate the comment!