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我正在尝试使用新的部分文档更新功能来修补 Cosmos Db 文档的子对象。但是，我找不到办法做到这一点。

如果文档如下所示，如何使用新的 Patch 方法将 ID 为 2 ProductCode 属性的子项（在 Items 数组中）更新为“A-111”？

{
    "id": "SalesOrder2",
    "ponumber": "PO15428132599",
    "OrderDate": "2005-07-01T00:00:00",
    "DueDate": "2005-07-13T00:00:00",
    "ShippedDate": "2005-07-08T00:00:00",
    "AccountNumber": "Account2",
    "SubTotal": 6107.082,
    "TaxAmt": 586.1203,
    "Freight": 183.1626,
    "TotalDue": 4893.3929,
    "DiscountAmt": 1982.872,
    "Items": [
        {
            "Id": 1,
            "OrderQty": 3,
            "ProductCode": "A-123",
            "ProductName": "Product 1",
            "CurrencySymbol": "$",
            "CurrencyCode": "USD",
            "UnitPrice": 17.1,
            "LineTotal": 5.7
        },
        {
            "Id": 2,
            "OrderQty": 2,
            "ProductCode": "A-456",
            "ProductName": "Product 2",
            "CurrencySymbol": "$",
            "CurrencyCode": "USD",
            "UnitPrice": 10,
            "LineTotal": 20
        }
    ],
    "_rid": "BsMkAMc43s4CAAAAAAAAAA==", …