The ePub format itself doesn't support dynamic zooming, unless you start using JS. Dynamic zooming is at the discretion of the app or device.
Some other formats that comic books use are .cbz or .cbr but you would also be at the mercy of the app/reader to support those formats...and the library would have to provide them in that format.
If the ebook is DRM'd then I would ask the library how to use the book. Good luck with that option...
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