I’ve played (a small amount) with Gingko, and liked it as a way of forming up thoughts as a second stage after atomic/evergreen notes. But I wanted to do it in Obsidian to leverage quoting, embedded, linking, all the Obsidian goodness - I’d definitely be keen on this.
And related, I was just looking at this New Plugin : a editable Mind map plugin for Obsidian plugin which although it’s displayed as a mindmap, is structurally very similar to what’s going on with Gingko (assuming you’re doing it all in one note, and if a node can be more than a single paragraph/heading/etc as it is in Gingko)