A good design-pattern approach to aggregate JSON-Data in Java

I need to extract (aggregate) particular information about satellites (this should be done in external Modules which will be loaded by e.g. reflection). Furthermore, the result of such aggregation, which can be hierarchically indefinitely deep, should be output by modules too (e.g. sysout, write to JSON)

An Aggregation of this JSON-data could be for instance:

- Sattelite A
   - Transponder B
      - 20 radio programmes
      - 10 tv programmes
   - Transponder C
      - 1 radio programme
      - 100 tv programmes

or

Sattelite a
   - english TV-Programme a
   - english TV-Programme b
Sattelite b
   - english TV-Programme a
   - english TV-Programme b
   - english TV-Programme c

Module-Overview

Any idea, which approach (design patterns, classes) would be appropriate to tackle this? I thought about generic composite.