qmk-firmware/keyboards/melgeek/mj64/rev3/info.json

{
    "rgb_matrix": {
        "driver": "IS31FL3741"
    },
    "matrix_pins": {
        "cols": ["B15", "A8", "B13", "A15", "B3", "B4", "B5", "B8", "B9", "C13", "C14", "C15", "A0", "A1"],
        "rows": ["B12", "B11", "B10", "B1", "A3"]
    },
    "diode_direction": "COL2ROW"
}