qmk_firmware/keyboards/kin80/blackpill401/keyboard.json

{
    "usb": {
        "device_version": "0.0.3",
        "shared_endpoint": {
            "keyboard": true
        }
    },
    "matrix_pins": {
        "cols": ["C14", "C15", "A0", "A1", "A2", "A3", "A5", "A6", "A7", "B0", "B1", "B10"],
        "rows": ["A4", "B12", "B13", "B14", "B15", "A8", "B5"]
    },
    "diode_direction": "COL2ROW",
    "indicators": {
        "caps_lock": "C13",
        "num_lock": "B4",
        "scroll_lock": "B3",
        "on_state": 0
    },
    "development_board": "blackpill_f401"
}