Just a nice little feature added to noxDB.

The json_copyValue let you copy between a source node and a destination node including a path modifier.

The following sample explains it all: 

noxDB is short for "Not Only XML" which is a library for RPG programmers to exploit XML, JSON and SQL in one developer model.

If you don't have this open source library, then grab it from
https://github.com/NielsLiisberg/noxDB