What are advanced_ocr_options[] for Google Cloud Vision? - opencv

I'm trying to find any information on the advanced_ocr_options[] under textdetectionparams of ImageContext.
https://cloud.google.com/vision/docs/reference/rpc/google.cloud.vision.v1#textdetectionparams
Google has several pages in their documentation which talk about these advanced features but I cannot find a list of them anywhere.
The following line runs without errors. But without the list of advanced ocr options I do not know what it means or what it may be doing.
response = client.text_detection(image=image, image_context={"text_detection_params": {"advanced_ocr_options": ["12"]}}
Please help shed light on this. Thanks for your help.

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