Apparently Amazon has bought a voice-recognition company, so native voice commands will probably show up in the next generation of Kindles.
Looking around, someone is having a go at this issue here. I don't know exactly how you set it up.
https://www.mobileread.com/forums/sho...d.php?t=118480
There is at least one ereader program for Android that has voice commands. However, not many e-ink readers have microphones. Seems the Kindle Keyboard does, but I don't think it is hackable to run Android.
https://play.google.com/store/apps/d...alReader&hl=en