Re-use multiple JSON items from another node inside an http node request body that also has data (Quickbooks node -> http node)

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I’ve just about got this working @Jon except I seem to be stuck now on gathering all my combined data and replace the Line field with it.

I’m following the suggestion from Jan in Function Node: Access all items from previous node output - #2 by jan however it seems to be adding an extra ‘json’ field to the output of each item:

image

Any idea how I can stop this from happening? I just need the raw output of the entire previous node to populate this field without adding the extra json key.