qmk_firmware/keyboards/keebio/iris/rev4/info.json

{
    "keyboard_name": "Iris Rev. 4",
    "usb": {
        "pid": "0x4256",
        "device_version": "4.0.0"
    },
    "split": {
        "soft_serial_pin": "D0"
    },
    "processor": "atmega32u4",
    "bootloader": "qmk-dfu"
}