How to generate preview images for EPUB, CBR and CBZ files?

I have the Ebook Reader App installed as well as the Previewgenerator App.

After running the command

php occ preview:generate-all

no preview images for .epub, .cbr and .cbz files were generated.

I would like to know how i can generate preview images for them.

This thread does not help me further: Which file types are supported and how to configure them?

Thank you!