[REQ] Compress folders to EPUB format

### Is your feature request related to a problem? Please describe
I want to turn folders back to epub format after editing them.

### Describe the solution you'd like
I can, with a few clicks, turn folders into epub files.

### Describe alternatives you've considered
I tried to convert to zip, and then renaming the file extension to epub. But it doesn’t work. Apple Books can’t read the file.

### Additional context
Keka can already decompress epub files, so compressing it back to epub, would make sense IMO.