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

{
    "features": {
        "bootmagic": true,
        "extrakey": true,
        "mousekey": true,
        "nkro": true
    },
    "matrix_pins": {
        "cols": ["B4", "D7", "D0", "E6", "D4", "F6", "F4", "F7", "B1", "B3", "C6", "B2"],
        "rows": ["D2", "D1", "F5", "B5"]
    },
    "diode_direction": "COL2ROW"
}