How to deserialize json object into flatten format direct field?

I have the following structure:

public class User {
    private Account account;
    //constuctors, getters and setters
}

public class Account {
    private String id;
    private String description;
    //constructor, getters and setters
}

When I performing the request I need to create the following JSON structure:

{
    "account": 
    { 
        "id": "1",
        "description": "Some description"
    }
}

But I want to specify this information in a short way and ignore(left 'null') the 'description' field in the following way:

{
     "account": "1" // I want to set directly the id field in the account object.
}

How may I do it? I tried @JsonCreator annotation and @JsonUnwrapped but without result.

You can use a custom deserializer

public class AccountFromIdDeserializer extends StdDeserializer<Account> {
  public AccountFromIdDeserializer() { this(null);}
  protected AccountFromIdDeserializer(Class<Account> type) { super(type);}

  @Override
  public Account deserialize(JsonParser parser, DeserializationContext context)
  throws IOException, JsonProcessingException {
    Account account = new Account();
    account.setId(parser.getValueAsString());
    return account;
  }
}

And use on account node of User using @JsonDeserialize

   public class User {
      @JsonDeserialize(using = AccountFromIdDeserializer.class)
      private Account account;
      //constuctors, getters and setters
   }

Finally I used @JsonCreator annotation and created two constructors:

@JsonCreator
public Account(@JsonProperty("id") String id, @JsonProperty("description") String description) {
    this.id = id;
    this.description = description;
}

@JsonCreator
public Account(String id) {
     this.id = id;
}