node-red function, that gets the port_overrides array of a specific Unifi device from the output of the node-red-contrib-unifi node's AccessDevices command.

extract-port-overrides.json

[
    {
        "id": "76e8dd64.3526ac",
        "type": "function",
        "z": "3eed02d1.e6900e",
        "name": "extract port_overrides",
        "func": "const deviceId = \"your device id\";\n\nconst port_overrides = msg.payload.flatMap(site => site)    \n    .filter(device => device._id == deviceId)\n    .flatMap(device => device.port_overrides);\nmsg.payload = port_overrides;\nmsg.device_id = deviceId;\n\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "x": 732,
        "y": 546,
        "wires": [
            []
        ]
    }
]