UI Dropdown - Populating Data

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I have a question how do I use payload in the opinion label

[
    {
        "msg.payload": "17260851BD"
    },
    {

msg.options=

[
    {
        "msg.payload": "17260851BD"
    },
    {
        "part_number_item2": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    },
    {
        "part_number_item": "17299989AC"
    },
    {
        "part_number_item": "17246783FB"
    }
];


return msg;