Referring the third layered nested repeating group

Hello Bubble community, I am trying to create a pdf using carbone io and in the workflow I have to link the dynamic fields with a JSON.
First repeating group is a list of A (text), when text is clicked, it will trigger Carbone to display data from first, second and third repeating group.
Second repeating group is a list of B that is in each A (child of A), which I am still able to refer it by choosing it’s repeating group name → list of B’s xxx by clicking the text in the first repeating triggered JSON workflow.
However, when it comes to the third repeating group, list of C in each B (child of B), I can’t refer to the name of the third repeating group as I can for the second repeating group.
Each repeating group is related by an assigned ID and the previous unique ID, for instance,
B’s ID = A’s unique ID
C’s IDc = B’s unique ID

Thank you in advance

Also, I saw similar topics and people suggested using plug in add on like RG Extractor and Orchestra, yet I installed both but did not see their element action items in my workflow… do I have to add them in API connector and initiate them?

You can refer to B because it is on the same layer of the click element. Maybe you can create a state on B and fill it with the contents of RG C