Capacities.io is another object-based note-taking app similar to Tana, Craft, Notion, etc. I have used them all, but this one is my favorite. It does have an API (info here: Capacities API | Capacities Docs). Maybe there are other Capacities Fans out there…
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I also came here looking for discussion of a Capacities extension! I am not one to make it myself, but +1 to this request.