It says Google OCR in the usage example, but your description above mentions GPT-4 vision. So this makes no sense. I see nothing about Open AI API key in the example.
We use Google OCR to convert the screenshot into whitespace-structured text for unimodal LLMs. For multimodal LLMs like GPT-4V, you don't need to use the OCR utilities. Thanks for the feedback though, we'll clarify!