This has some similarities to the already richly supported properties in
Logseq. I would suggest that making it possible to create rich relationships in line in one’s writing makes a huge difference (when I tried to use properties to do this, I ended up writing a lot of my notes in the properties, making my notes look more like a database table than an outliner or writing tool). I’m happy to discuss this more as I think the difference between this proposed functionality and properties is a subtle but important one.