qmk_firmware/keyboards/kin80/blackpill401/info.json

{
    "usb": {
        "device_version": "0.0.3"
    },
    "indicators": {
        "caps_lock": "C13",
        "num_lock": "B4",
        "scroll_lock": "B3",
        "on_state": 0
    },
    "processor": "STM32F401",
    "bootloader": "stm32-dfu",
    "board": "BLACKPILL_STM32_F401"
}