Generating signature to a custom location

[Esa Kytola]

Hello,

I have wsdl and xsd description of a webservice and its data. I have generated 
Webservice Java client sources using Apache CFX.

I am trying to call a Webservice that requires a Signature in the body element 
like this:

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
  <soap:Body>
    <ns3:Echo xmlns:ns2="http://www.w3.org/2000/09/xmldsig#"; 
xmlns:ns3="http://www.tulorekisteri.fi/2017/1/Echo";>
      <Data>Test</Data>
      <ns2:Signature/> <-- signature should go here
    </ns3:Echo>
  </soap:Body>
</soap:Envelope>

I can generate signature using CFX with WSS4JOutInterceptor. Also I have tried 
to generate signature using WSS4J "Standalone approach" 
(https://ws.apache.org/wss4j/using.html).

With both aproaches the signature is written under the Soap Header -> Security.

Is there a way to configure WSS4J to write the signature part to a custom 
location/node?

I have tried to see from configuration options from 
https://ws.apache.org/wss4j/config.html but I couldn't catch anything obious.

Best Regards,
-Esa