Updating Data type from int to decimal

Working with Data
,
1

Hello everyone I am trying to modify the data type of transactionAmount in tagLineItems but unable to update the data type.

{
  "_id": {
    "$oid": "6374aaa6d30e9e74980796d9"
  },
  "isMigrated": true,
  "isDeleted": false,
  "paymentId": {
    "$numberLong": "1"
  },
  "paymentDetails": {
    "tag": [
      {
        "vehicleNumber": "MH03S6692",
        "vehicleClass": "Car/Jeep/Van",
        "tagAccountNumber": {
          "$numberLong": "20001121"
        },
        "transactionAmount": {
          "$numberDecimal": "806"
        },
        "tagLineItems": [
          {
            "transactionAmount": 200,
            "appTxnCode": "TagBal"
          },
          {
            "transactionAmount": 325.1,
            "appTxnCode": "TollBal"
          },
        ]
      }
    ]
  }
}
2

This looks a lot like Update the DataType for a field inside the Nested Array.