The easiest method is to find dedicated comic conversion software on the internet. Many of them have simple instructions that guide you through the process of converting comics to cbz. Just make sure the software is reliable and compatible with your comic files.
CBZ is often preferred for comics as it's a simple archive format that retains the original image quality. Epub might reformat the pages, which could affect the comic's layout.
I'm not sure about specific places to download manga in CBZ format. You might try some manga-related forums or communities to see if anyone there has suggestions.
You can usually do it through the settings or preferences option in the relevant software or platform. Just look for a 'folder management' or 'add folder' option.
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