Does this page of the Documentation help or are you looking for something different? https://www.dynatrace.com/support/help/server-side-services/service-monitoring/how-do-i-monitor-3rd-party-service-providers/
I still don't think this is it. We used that to define a batch service, so I'm aware of that configuration.
One of our microservices is using the elasticsearch transport client, and rather than showing calls to elasticsearch, it shows that time as being spent in our process. we would like to specify the call to elasticsearch (unmontiored) as its own component in our service flow and timings