Yes you can. First you need to create a 'request attribute' , you can do this as 'global' or filtered to a specific application or component. More info here: Request attributes | Dynatrace Docs
* You can use this approach to make any field searchable within distributed trace.
As a request attribute, you can call out the 'Referer' which will be captured and then made searchable.
global capture example below.
Once in distributed traces, you can then search / filter using the following
- All matching instances
- specific instance