ReactJS:数组中的和值

我有一个数组(categorizedDatas)，其中包含以下内容:

{
    "4x4": {
        "items": [
            {
                "Category": "4x4",
                "Quantity": 1,
                "packingLocation": "4x4",
                "SubCategory": "ACCESSORIES",
                "Name": "Rear seat",
                "Brand": "TOYOTA",
                "Qty": 1,
                "Owner": "Shared",
                "Status": "Ready",
                "Weight": 31.5,
                "RepairNotes": "",
                "Kit": "",
                "KitDetails": "",
                "LoanedTo": "",
                "StorageLocation": "SHED",
                "id": "974e2e40-0c6b-11ec-90f3-ff0167255365"
            },
            {
                "Category": "4x4",
                "Quantity": 1,
                "packingLocation": "4x4",
                "SubCategory": "ACCESSORIES",
                "Name": "Second row shelf - middle",
                "Brand": "CUSTOM",
                "Qty": 1,
                "Owner": "Shared",
                "Status": "Ready",
                "Weight": 2,
                "RepairNotes": "\nd\ndf\n\ndf\ndf\ndf\nd\nd\n\nd\ndf\ndfdf",
                "Kit": "",
                "KitDetails": "",
                "LoanedTo": "",
                "StorageLocation": "4x4",
                "id": "97a37a30-0c6b-11ec-90f3-ff0167255365"
            }
        ]
    },
    "Camper": {
        "items": [
            {
                "Category": "4x4",
                "Quantity": 1,
                "packingLocation": "Camper",
                "SubCategory": "FUEL STORAGE",
                "Name": "Diesel Jerry Can 20L",
                "Brand": "SCEPTER",
                "Qty": 2,
                "Owner": "Shared",
                "Status": "Fill",
                "Weight": 22.6,
                "RepairNotes": "",
                "Kit": "",
                "KitDetails": "",
                "LoanedTo": "",
                "StorageLocation": "4x4",
                "id": "92f3fbe0-0c6b-11ec-90f3-ff0167255365"
            },
            {
                "Category": "4x4",
                "Quantity": 1,
                "packingLocation": "Camper",
                "SubCategory": "ACCESSORIES",
                "Name": "Second row shelf - top",
                "Brand": "CUSTOM",
                "Qty": 1,
                "Owner": "Shared",
                "Status": "Ready",
                "Weight": 5.4,
                "RepairNotes": "",
                "Kit": "",
                "KitDetails": "",
                "LoanedTo": "",
                "StorageLocation": "SHED",
                "id": "97867c50-0c6b-11ec-90f3-ff0167255365"
            }
        ]
    }
}

我要做的是根据分区对重量字段求和(即，计算4x4以下的所有重量，并计算Camper下的所有重量).

我该怎么做呢，我已经试过了各种各样的修改.减少但都会返回一个错误，所以不确定我会错在哪里，或者这是否可能...