How to use the "Extra" field

I am trying to cite from a recorded audiobook; I want to use Book as my item type and put some additional info in the Extra field.

I know that MLA style will pick up certain tags from Extra, like "original-date." What I don't know is, What are all the tags that will be recognized from the Extra field? If that depends on my CSL style, where can I find that info in the style?

Thank you!
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