qmk_firmware/keyboards/tkw/grandiceps/rev2/keyboard.json

{
    "keyboard_name": "Grandiceps Split rev2",
    "usb": {
        "device_version": "0.0.2"
    },
    "eeprom": {
        "driver": "i2c"
    },
    "features": {
        "pointing_device": true
    },
    "split": {
        "handedness": {
            "pin": "B3"
        }
    }
}