neolalit1: that's not e-ink, and it doesn't address the OP's format needs either.
I'm sorry hatasi_abb, I don't know of any mainstream e-ink device that meets your exact specifications. Are all of them essential? For example, would you compromise on a tablet rather than an e-ink device, or on converting your documents to another format?
There is a thread from last year about Onyx Boox handling large CHM files:
https://www.mobileread.com/forums/sho...d.php?t=143929
but again, you're looking at either six inches or 9.7 inches there. Maybe someone will be along soon with a rec for a niche ereader that fits.