support summary on nodes
Would like to support summary (using brace), which let me to put some comment/summary for a set of nodes

i’m not sure I understand this. Can you give us a more detailed example? Also, how would this be useful, what would that enable you to do with a map better?
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Haboubi commented
this feature is supported in Freeplane
its explained in this video
https://www.youtube.com/watch?v=t6Wiz8g6PsM -
Ismael Torres commented
Not sure what the original suggestion was, but probably referring to the ability of using the Notes pane to visualize the collection of notes of all nodes for the current and all child nodes. I believe this would be the equivalent of collapsing/expanding nodes in the visual representation of the map. The text representation of the notes for the nodes may use indentation, name of nodes identified using braces, probably an option to include attributes of the node (like its URL).
So even if a node is collapsed in the visual representation, the Notes pane can still show what is under it.
A step further may be the ability of selecting *some* of the sibling nodes of a parent, or even unrelated nodes and come up with the corresponding outlined text.