HELP with getting from Chat GPT a table to then look for EAN in a Google Sheet

I need your help. I am trying to automatice receiving a purchasing order in my Inbox and then with IA understand if it an order and extract the information.

The first part I have been able to do it. Download the PDF read the PDF (converted into tex) and the analyse the PDF. Now I need to table with EAN code, name of product and quantity. In order to ask google sheets to make the PO. I was able to do it in 8n8 but here seems impossible.

Because when Chat GPT acts is bring a full string that I transform to jason but I am not able to get the 3 values that they come. Just the first one