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ZMK support is already added. By default it assumes the usual OLED pins for the 4 connections in the header and D0 (usually used for LEDs) for the extra one to be bodged, but you can override them.
Customizing widgets is doable with ZMK that uses LVGL but it is not very end user friendly at the moment. You'll probably need to fork ZMK and modify the status screen (unless you use a custom board definition). It's definitely possible though, e.g. I played around to add new images to the Corne-ish Zen display, or an animated WPM widget for OLEDs.