Send a list of list to backend API body


I have an api that I have configured to be called in a backend workflow, One of the parameters of the request should be a list of list like so;

“line_items”: [
“item_id”: 98,
“name”: “Example1”
“item_id”: 99,
“name”: “Example2”

These are created by a workflow and stored in the db, if its of any interest.

My question is; how do I send a json list (like above) to the API call in the backend workflow? Honestly, I have been thinking, but not able to crack it and need some assistance.

Thank you.

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