Perhaps the viewer part of calibre server could be repackaged as a PWA, with a standard FileReader interface to get books. This would make the viewer available on mobile devices without any need to get into the details of the mobile OSes and--I think--without a lot of work.
The "perhaps" is because I couldn't actually locate the javascript code that is the viewer part of the server so I don't really know how complex the conversion would be.
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