I wrote something similar here!
I have a different method of implementation that would be easier and keep the original Anytype structure in place. This would also be a faster rollout as a result I would assume.
I do think this feature is important and is the very root of note taking and organization of such. Visuals are key in understanding and bringing together ideas. This could really help set Anytype up to hit on a greater target of note takers and have a catering to them all in a unique way.