I'm working with non-spatial objects in a Utility Network version 4 and created a network diagram template (ArcGIS Pro 2.7.3, Enterprise 10.8.1). I've been able to apply map symbology to this template from a map that holds a database connection for all my spatial features using the Create Diagram Layer Definition GP tool. Upon diagram creation using this template, the diagram also visualizes the non-spatial objects that have a containment association with selected spatial objects; for instance Structure Junction Objects within a Structure Boundary, but it uses a default symbology. How do I set my own symbology and how can I add labeling for these non-spatial objects in the diagram template?