Need Help adding a Component DFF to Item Structure Report

Summary:

We have Setup a custom Component DFF in item Structure, we need to add the custom dff field in to the Item Structure seeded report. In the data model we are not able to see an option to add query to add the field. we tried to customize the template using the doc provided by oracle but we are not able to custome the sample xml file to add the the new dff field. I need your help to figure out how to extract the new field from the instance so we can add the xml field into the standard