There is no metadata file stored within cbz format books (that I'm aware of anyway). So the only thing Marvin has to go off is the filename. I haven't found a way for Marvin to parse filenames but it does use the filename as the "title". Perhaps you can use a "save-to-disk" template in Calibre to make the filename into something more useful to you??
I use the following template:
{author_sort} - {series} {series_index:0>2s}
Which gives something along the lines of:
Kirkman, Robert - The Walking Dead 02
That at least allows me to sort the files in order.
If you do find something that works, I'd be interested to hear it - and it might help others here as well.
Cheers!
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