When a book, not matter what type is sent from calibre to a device, the book is copied to the device. Calibre can make changes (it makes sure the latest metadata is in the book), but in general, calibre doesn't fiddle with the device.
For Kobo device, the drive copies the book to the device. Then leaves it to the device to process the book and add it to its database and hence the library. It is up to the Kobo device to retrieve the metadata from the book to put into the database. It does this for book types with well defined metadata. And that probably means the book type has an official standard for metadata. Even then, it doesn't read all the metadata.
I don't know how the metadata is stored in a CBR/CBZ. But, apparently the Kobo devices don't read it. About the only thing you can do is contact Kobo and ask them to add support.
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