Repeating Group inside a Repeating Group (Pass data)

I have a Reusable list (Yellow) that is inside a Repeating Group (Red) that is inside another Repeating Group (Blue).

I need to pass the Parent Tab (Blue) to the Reusable list (Yellow), so I can segment the Reusable list according to the two variables.

Any idea how to do this?

I’m passing the Parent Attribution (Red) through the Data source to the Reusable (Yellow), but I don’t see a way to pass the Parent Tab (Blue).