If you export the entire course, it includes the question banks. One can import the IMSCC package with Select Specific Content chosen, then choose to import only question banks. But, you may not wish to include the entire course just to share the question banks, so it's not ideal.
FYI Question Banks are in the non_cc_assessments folder of the exported course file, each one containing objectbank. I am only including this information because it took me a while to figure it out. There's not a lot of information about QTI and Canvas IMSCC formats out there and someone might work out a way to include only the questions banks in an edited file; noting the images are in a different folder and that would have to be included too.
Right now you can't export new quizzes at all. It's on the Product Roadmap for July 2023 but doesn't mention item banks, just quizzes. I hope the Instructure engineers are working on exporting both or either, and choosing all or some. Thank you Instructure for listening!
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