There isn't a way to do that. You're going to need to go into each context for each option-based custom field (select type fields, radio buttons, checkmarks, etc) and simply scrape the list of options into a doc.
I'm not sure a huge list like that is of much use in a review. You are probably going to be better off running a search for each field for "field is not emply" and looking at what ir returns to see how used a field is.
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