hi deep nesting is not working.
even on your demo page deep nesting doesnt work -- check education / teachers it creates the + for teachers but no input fields
In the Dev branch things are slightly better (it does create the input fields but it doesn't save). I will look into it, but as I have no need for this functionality myself at the moment I cannot say when.
If you were to work on it yourself I would provide what assistance time allowed.
This is now duplicated by #41 and as this issue has had no activity I am closing it in the hope that #41 gets resolved.