How Can I Access the Task ID of a Task in a Subprocess

I have: 

  • Process Model A
  • Process Model B, a sub-process in Process Model A
  • Task C in Process Model B
  • Process Model A Backed Record Type

For each instance of Process Model A, I want to set up a task link to the corresponding instance of Task C indirectly created by Process Model A. To do so I need it's associated Task ID.

How can I get this Task ID in the Process A Backed Record Type, without using Plug-ins?

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