My object s something like mentioned below

const items = 
    [
        {
            "creationTimeStamp": "2022-05-31T17:04:28.000Z",
            "modifiedTimeStamp": "2022-05-31T17:04:28.000Z",
            "locations": [
                {
                    "id": "5ao",
                    "name": "Store1"
                }
            ],
            "typeId": "Lead"
        }
    ]

I am trying to push below object into locations property

{
"id": "9a0",
"name": "Store2"
}

I have tried doing

items1 = [];
for (var i = 0; i < items.length; i++) {
items1.id = "9a0";
items1.name = "Store2";
//9 is some static index value added
Object.assign({9 : items1}, items[i].locations);
}

if i console(Object.assign({9 : items1}, items[i].locations)); i can see 2 arrays inside it but my items locations property is still the same. My expectation is as below please suggest

[
    {
        "creationTimeStamp": "2022-05-31T17:04:28.000Z",
        "modifiedTimeStamp": "2022-05-31T17:04:28.000Z",
        "locations": [
            {
                "id": "5ao",
                "name": "Store1"
            },
            {
                "id": "9a0",
                "name": "Store2"
            }
        ],
        "lead": "Lead"
    }
]