API content type bib+html?

I'm looking for a way to request both a styled citation (ala content=bib) and extracted out data (ala content=bib). Making two requests to get this information is inconvenient and slow.

My request is either: (a) provide a way to request multiple content types, or (b) introduce a new content type that merges bib+html.

If there's already a way of doing this in a single request, please let me know!
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