Comics in epub may be a bit tricky, as they can be in a weird format. If they're simple images in epub files, you can extract them, then convert them with KCC into a usable file. Epub files can be opened with any file archival program line winrar. Just extract content and look at what it contains. If you end up with single page images, then the process shouldn't be hard.
You can also just extract them then do this process to convert them into kfx:
https://www.mobileread.com/forums/sh...postcount=1601