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Nested Expression: Using dynamic field when referencing Value from an action

I posted something similar to this yesterday with no response some I'm rewording to see if I can get some responses.

Lets say you have an action We will call it action A with fields 1,2,3. Then we have List B. each record of the list contains two values ASchemaField, and AfieldValue.

you will need to loop through List B records until you can match ListB.AfieldValue with its appropriate Action A field.

How would you go about resolving this Expression to reference the correct action A field. My method seems to always return blank. Below are a few iterations I have tried to return.

outputs('action_A')?[items('Apply_to_each')?['List_B.ASchemafield']]

outputs('action_A')?[concat('''','body/',items('Apply_to_each')?['List_B.ASchemafield'],'''')]

outputs('action_A')?[concat('''',items('Apply_to_each')?['List_B.ASchemafield'],'''')]

My other post is referenced here and is more specific to my scenario https://powerusers.microsoft.com/t5/Using-Flows/Inception-Expression/m-p/1616907#M31250

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