qmk_firmware/keyboards/handwired/onekey/rp2040/keyboard.json

{
    "keyboard_name": "Onekey RP2040",
    "processor": "RP2040",
    "bootloader": "rp2040",
    "matrix_pins": {
        "cols": ["GP4"],
        "rows": ["GP5"]
    },
    "backlight": {
        "pin": "GP25"
    },
    "ws2812": {
        "pin": "GP25"
    }
}