With the release of ArcGIS Pro 2.7, a new capability called Trace Configurations is available for use with the trace network.
This video on the topic was recently published with a focus on the ArcGIS Utility Network; however, wanted to share here as the same concepts and tools apply when working with the trace network as well.
Learn more about how to use trace configurations in a trace network
Will this make it easier to publish the trace tool as a GP Service to Portal? I tried to publish just the Connected Trace tool as a GP service and when I tried to run a simple connected trace in my app it returned a ton of errors, as if I didn't have any parameters set.