That makes sense. 
Unfortunately, there's not a great native option for OCR within a Retool workflow. For such use cases, I usually recommend folks import a Python library or make a query directly to the LLM of their choice. Either way, it'll typically be necessary to do so from within a loop.
At a high level, retrieving data via an API request and then performing an operation on each individual element from within a loop is a super common pattern. There are some good examples here in the community, in addition to the docs that I linked above. Let me know if you have any questions! And if you feel like you want some additional assistance, we host Office Hours every Tuesday and Thursday. 