I managed to create a pseudo dark mode for Evernote on Mac (but only using a web browser, namely Opera.) This of course is not a permanent solution but it helps me type notes out at night although I use dark mode everywhere since my eyes can't handle bright white light for a long period of time. I simply installed Opera, and this Dark Mode add-on then wrote my notes on the web version of Evernote. The results were good. The Night Mode extension is also available on Chrome but I am not sure if it works properly. There are a few drawbacks, namely some visual glitches and the fact that notes created will have a dark text background on the Mac and mobile Evernote versions, but I can live with that. I really hope they add Dark Mode to Evernote, as someone else stated, this single feature would make me a Premium user again for sure.