JavaScript / EWM: Custom Presentation - How to add work item to work item list attribute?

Hello,

We are developing a custom presentation for a work item list attribute. After the user creates a new work item we need to add it to our work item list attribute. Note: This is an attribute of kind work item list. It is not a link.

How do we add a work item to the work item list attribute?

I get the current work item list just fine:

var workItemList = this.workingCopy.getValue( {
                            path: ["attributes", this.attributeId ],
                        });

workItemList is set to (for example):
{
​_eQualifiedClassName: "com.ibm.team.workitem.rest.dto:ListDTO",
items: (1) [
​​0: Object { itemId: "_7OqAYCT5EeubHdT_idS2yQ", stateId: "_7PGFTyT5EeubHdT_idS2yQ", _eQualifiedClassName: "com.ibm.team.workitem.rest.dto:WorkItemDTO", … }
​​],
length: 1,

How do we add to this list and update the work item list attribute value? Do we need to (somehow) create a new WorkItemDTO? Add it to the Items array? And then call .setValue()? Thank you for any help and advice.

Regards,
Kevin