Unmarshaling JSON into Struct

I am trying to Unmarshal the following JSON string into the struct below;

{
   "io.confluent.connect.avro.ConnectDefault":{
      "lastModifiedAt":{
         "string":"2022-09-01T02:22:19+00:00"
      },
      "taxRateId":{
         "int":5
      },
      "basedOn":{
         "string":"Markup"
      },
      "priceTax":{
         "double":2.04
      },
      "price":{
         "int":24
      },
      "status":{
         "string":"active"
      },
      "costPrice":{
         "int":24
      },
      "createdAt":{
         "string":"2022-09-01T02:22:19+00:00"
      },
      "productId":{
         "int":3545
      },
      "ownershipId":{
         "int":1
      },
      "dbId":{
         "int":3655
      },
      "markupPercentage":{
         "int":0
      }
   }
}

type Wrapper struct {
	Message `json:"io.confluent.connect.avro.ConnectDefault"`
}

type Message struct {
	DbId Field `json:"dbId"`
}

type Field struct {
	Value map[string]interface{}
}

But it gives me an empty value for the Field map. Not sure what I am doing wrong here.

It's because you have extra level of nesting:

type Message struct {
	DbId map[string]interface{} `json:"dbId"`
}

dbId property's value is a map of strings to anything.