Just use cbz instead. A cbr is nothing more than a rar archive with images. Cbz is exactly the same just zip encoded. Calibre does not convert to cbr because rar is not open and not free to use. Zip is free, so it could be used. I don't know if there is an option to use rar if you own it, but I doubt it. So just use cbz, all comic viewers I know display both formats.
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