qmk_firmware/keyboards/kprepublic/cstc40/daughterboard/keyboard.json

{
    "matrix_pins": {
        "cols": ["B15", "B14", "B13", "B10", "B12", "A5", "C4", "A7", "A15", "C10", "C11", "C0"],
        "rows": ["B1", "B0", "C5", "A6"]
    }
}