我下面有一个对象数组，需要获得预订对象的计数，并且计数需要添加到每个对象中

const arr = [
{
    "ID" : 1,
    "Name":"ABC",
    "Bookings":[
        {
          "BookingID": 1,
          "item": "Rice and Flours"
        },
        {
          "BookingID": 2,
          "item": "Pulses/Dals"
        },
        {
          "BookingID": 3,
          "item": "Oils"
        },
        {
          "BookingID": 4,
          "item": "Oils"
        },
        {
          "BookingID": 5,
          "item": "Rice and Flours"
        }

    ]
},
{
    "ID" : 2,
    "Name":"EFG",
    "Bookings":[
        {
          "BookingID": 1,
          "item": "Pulses/Dals"
        },
        {
          "BookingID": 2,
          "item": "Pulses/Dals"
        }

    ]
},
{
    "ID" : 3,
    "Name":"IJK",
    "Bookings":[
        {
          "BookingID": 1,
          "item": "Spices And Nuts"
        },
        {
          "BookingID": 2,
          "item": "Dairy Products"
        }

    ]
}

]

代码：-

const groupArray = (arr = []) => {
   // create map
   let map = new Map()
   for (let i = 0; i < arr.length; i++) {
   
        for (let j = 0; j < arr[i].Bookings.length; j++) {
             
             const s = JSON.stringify(arr[i].Bookings[j]);
              if (!map.has(s)) {
                 map.set(s, {
                    ID:arr[i].ID,
                    BookingID: arr[i].Bookings[j].BookingID,
                    item: arr[i].Bookings[j].item,
                    count: 1,
                 });
              } else {
                 map.get(s).count++;
              }
        }
   
      
   }
   const res = Array.from(map.values())
   return res;
};

上面的代码没有按预期工作，我只想按属性对JSON对象进行分组，并计算相同出现的次数。
输出应该如下所示：

const arr = [
{
    "ID" : 1,
    "Name":"ABC",
    "Bookings":[
        {
          "BookingID": 1,
          "item": "Rice and Flours",
          "Count": 2
        },
        {
          "BookingID": 2,
          "item": "Pulses/Dals",
          "Count": 1
        },
        {
          "BookingID": 3,
          "item": "Oils",
          "Count": 2
        },
        {
          "BookingID": 4,
          "item": "Oils",
          "Count": 2
        },
        {
          "BookingID": 5,
          "item": "Rice and Flours"
          "Count": 2
        }

    ]
},
{
    "ID" : 2,
    "Name":"EFG",
    "Bookings":[
        {
          "BookingID": 1,
          "item": "Pulses/Dals"
          "Count": 2
        },
        {
          "BookingID": 2,
          "item": "Pulses/Dals"
          "Count": 2
        }

    ]
},
{
    "ID" : 3,
    "Name":"IJK",
    "Bookings":[
        {
          "BookingID": 1,
          "item": "Spices And Nuts",
          "Count": 1
        },
        {
          "BookingID": 2,
          "item": "Dairy Products",
          "Count": 1
        }

    ]
}

]

有人能帮我一下吗？