qmk_firmware/keyboards/binepad/knobx1/keymaps/default/keymap.json

{
    "config": {
        "features": {
            "encoder_map": true
        }
    },
    "encoders": [
        [
            {
                "ccw": "KC_VOLD",
                "cw": "KC_VOLU"
            }
        ]
    ],
    "keyboard": "binepad/knobx1",
    "keymap": "default",
    "layers": [
        ["X1_LYRU", "KC_MUTE"]
    ],
    "layout": "LAYOUT",
    "version": 1
}