Hello, I want to implement a graph. Click to expand this node. There is a new flowchart in the node and it can be dragged and zoomed. Do you have similar cases
Use Groups:
https://gojs.net/latest/intro/groups.html
https://gojs.net/latest/intro/subgraphs.html
However, groups are not diagrams, so one cannot chaange the scale within the group independently from outside of the group.