Extract the edited tree as object/json

[rokoplestina]

I have seen many examples in your storybook, but didn't understand how to get the new tree structure out of the component. What I mean is the following workflow:

1. I provide my initial tree structure to the component
2. I edit the tree
3. Extract the new tree as object, json or whatever savable ;)

So I am failing to understand how to do the number 3.

Thanks in advance for your help!