Problem with nested JSON

[Gribouillis]

The problem is how to generate that json structure

The problem is not to generate a json structure, it is to transform an existing structure into another one. In order to do this programmatically, you need to explain the rules to do that, at minimum show specific input data and the exact output data that is related with this input.

If we want to translate hieroglyphs into greek and we don't have a dictionary, we need at least a Rosetta stone.