The latest update for the Poco Launcher brings Dark Mode (its hidden in the Settings menu, hit More and then Backgrounds). You can also customize the transparency of the background in the app drawer, including setting it to pure black.
The Pocophone F1 itself doesnt have an OLED screen, so you wont get the battery savings of Dark Mode, but the phone will still be more pleasant to use late in the evening. Of course, you can download the Poco Launcher on any Android phone from the Play Store (hit the Source link). Also, if youre running a MIUI 10 phone, youll have a system-wide Dark Mode to match.
The new version of the launcher brings other improvements as well. For one, you can add custom apps to the App Vault. Also, double tap to lock should work on all compatible models now. The rendering of icons have been improved for a crisper image and a bug with white backgrounds has been fixed.