I recently discovered the new "save cover to file" option and am quite happy with it so far

I have a rooted "Energy Sistem eReader Pro+", which seems to be essentially a Boyue T62.
I use my favorite automation tool "Automagic" (look for it in Play Store!) to pick up the saved cover file from CC, scale it to the appropriate dimensions of 1024*758, rotate it by 90° and then move it to /system/media/ with Automagics root functions. Works like magic!
However, the cover saved by CC seems to have a very low resolution

Would it be possible to extract the original cover from the ePub file and store it?
And, for good measure, store a text file next to it with the full path of the opened ePub? That would perhaps open some other possibilities for automation (or allow me to extract the cover).