How can I get value from "Found In" Attribute for a RTC defect workitem?

I want to get value from “Found In” attribute and set the same value in another attribute in defect workitem. I have experience to get value from enumeration attribute type but I could not able to get value form found In attribute. I have created below code for my requirement. So could you please check my code and let me know the correct code?

FYI:

dojo.provide("Valueset");

dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");

 (function() {

    dojo.declare("Valueset", null, {

getValue: function(attribute, workItem, configuration) {

var foundIn = workItemClient.findAttribute(projectArea, workItem.FOUND_IN_PROPERTY, monitor);

var deliverable = workItem.getValue(foundIn);

return deliverable;

  }

});

})();