Add map as input to serviceTask using Fluent Builder API

I need to use Fluent Builder API to generate flow chart. But I don’t know how to use map as input

CamundaMap element = Helper.createElement(extModelInstance, CamundaMap.class);
element.getCamundaEntries().add(addEntity(parent,extModelInstance,k,v));

public static CamundaEntry addEntity(BpmnModelElementInstance parent,BpmnModelInstance extModelInstance,String k,String val){
CamundaEntry camundaEntry = Helper.createElement(extModelInstance, CamundaEntry.class);
camundaEntry.setCamundaKey(k);
camundaEntry.setTextContent(val);
return camundaEntry;
}