Mind map + note taking?

I already use obsidian, and I know you can see the interconnections between notes in its graph view.

I'm looking for something that follows a more structured graph view. One note can function as the root node, which branches in other daughter nodes, which in turn can branch into other daughter nodes. A mind map like structure instead of a web of interconnections. I know some mind mapping tools like Xmind but I feel they don't really lean too much into the note taking aspect.

Something with markdown support and rich text editing would be amazing. If such a tool even exists, this sub really is my best bet.