No idea about Pocketbook.
For KOReader you can add them yourself to /mnt/ext1/applications/koreader/data/hyph and edit the file /mnt/ext1/applications/koreader/frontend/apps/reader/modules/readertypography.lua to include the new definitions.
If you go that route you'll need to update readertypography again after each update, so please consider submitting the patterns upstream: hopefully they can be integrated in both KOReader and Coolreader
See a recent example which added two latin hyphen patterns:
https://github.com/koreader/crengine/pull/393