Marshal POJO to XML Without DTO level tag in Spring Framework

Question

Within the Spring framework, I am looking use RestTemplate (yes I know rest template isn't ideal but the infrastructure is already in place) to POST a DTO DtoRequest with parameters field1, field2, and field3. When the request body is marshalled, it looks like:

<DtoRequest>
  <field1>field 1 value</field1>
  <field2>field 2 value</field2>
  <field3>field 3 value</field3>
</DtoRequest>

However, the api I'm hitting actually needs a request body without the <DtoRequest> tag so that it looks like:

<field1>field 1 value</field1>
<field2>field 2 value</field2>
<field3>42</field3>

This is proving harder for me than I feel like it should be; I thought there would be an annotation I could use to make this happen, but I'm not finding a convenient one. I'd prefer not to set a custom marshaller if I don't have to. Right now the dto class looks like

@JacksonXmlRootElement
public class DtoRequest {
  @JacksonXmlProperty
  private String field1

  @JacksonXmlProperty
  private String field2

  @JacksonXmlProperty
  private Integer field3
  
  //Getters and setters
}

Any help is greatly appreciated!