That is not what I am after. I want to fully treat a group like a node. Only one summary can be placed and it can’t have child nodes.
I think adding this would benefit many users here. The mind map is the most important feature of your app, and adding ways of connecting the notes should be a big focus for you.
Together with the other popular feature request by another user of allowing one note to have two (or more) parent notes, this would make your app complete for mind map usage.