Display of and navigation within complete hierarchy possible?

Dear Community,
we plan to have 5 levels with
2 phases
9 sub-phases
some 100 scenarios
some 300 processes and
some 1200 process steps
with exactly 1 process model in Flowable representing each entity. So, we will be utilizing the structural elements, mainly the “CallActivity”, to model the complete hierarchy/workflow.
I have two questions:
Is there a possibility, either in Flowable or via another open source tool, to

  1. display the whole structure on one single screen?
  2. (as 1 does not make much sense in practice) display levels with respective sub-levels only, but then offering the possibility to navigate through the structure back and forth by clicking on the screen elements?