As far as I can tell, there is not. I really wish the feature would be added

Sure! So, “.cbz” and “.cbr” files are literally just a folder of images in zip or rar files respectively, with the file extension changed so they will open in a comic reading app instead of being unzipped/unrared when you click on them. So as long as the filenames of the zipped images are in the correct alphabetical order, all you have to do is change the “.zip” at the end of the filename to “.cbz” (or “.rar” to “.cbr”).