qmk_firmware/keyboards/signum/3_0/teensy/keyboard.json

{
    "features": {
        "bootmagic": true,
        "extrakey": true,
        "mousekey": true,
        "nkro": true
    },
    "matrix_pins": {
        "cols": ["C6", "D2", "B7", "D3", "D0", "F7", "F5", "B6", "B5", "B4", "D1", "D7"],
        "rows": ["B0", "B3", "F6", "C7"]
    },
    "diode_direction": "COL2ROW"
}