Extensions of ExternalTask

Hi
I need help. Tell me, please, how can I get extensions properties out of ExternalTaskImpl?
Thank you

@Anton, external task is also type of Service Task which have attribute called “Topic”, so you can get extension elements from FlowElement from execution like below,

public void execute(DelegateExecution execution) throws Exception {
   ExtensionElements serviceTaskExtensionElements = execution.getBpmnModelElementInstance().getExtensionElements();
   Collection<CamundaProperty> serviceTaskProperties = serviceTaskExtensionElements.getElementsQuery()
          .filterByType(CamundaProperties.class).singleResult().getCamundaProperties();
 }