qmk_firmware/keyboards/handwired/onekey/blackpill_f401/info.json

{
    "keyboard_name": "Onekey Blackpill STM32F401",
    "development_board": "blackpill_f401",
    "matrix_pins": {
        "cols": ["B0"],
        "rows": ["A7"]
    },
    "backlight": {
        "pin": "A0"
    },
    "rgblight": {
        "pin": "A1"
    }
}