How do I loop dynamically over more than one task

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I'm wondering how to setup a loop over pseudocode such as:

while task_a():
    task_b()

With data flowing from task_a to task_b and back. Once I get this working, would like to add more tasks and edges to the "loop body".

What I was trying to do is have them both raise "LOOP()", give them both state handlers, and set task_b as manual_only.
Then was having state_handler_a, when it detected a loop, start task_b with the data in it and modify the state so as to pause task_a... and vice-versa, until task_a's result is false.

But... is this the best way to do this? If so, where do I find the state of one task given another task? How do I "put resume: True" into the context of task_b, for instance (as well as any data to be passed)?

Is there a better way to do this?

This method is obviously a hack -- the problem is that it doesn't use edges to pass data, but don't see how to do that. However, if I wanted a bigger loop body, would I have to just make the hack bigger?

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Another method I thought of is start the loop body as another flow. The problem here is in-edges from before the loop ... I guess I'd have to marshall all of them? Is this a better idea?