Is there anyway to return both TestPhase and TestPlans details in a single RESTful API request?

With a specific project Area, I'm able to return all the TestPhases and a TestPlan ID for each TestPhase.

With a specific project Area, I'm able to return all the TestPlans but no TestPhase information.

I'd like to perform something like

<server>/qm/service/com.ibm.integration.service.IIntegrationService/resources/<project area>/testphase?

with

fields=feed/entry/content/testphase/(testplan/(title|webID)|starttime|endtime|title)

The concept being that with each testPhase, I would also get the details of the TestPlan (title, webid, etc.).  It seems, however, than I can only return the testPlan @href (the id) and nothing more.

In SQL terms, I want to inner join the testPhase on testPlan.  Is there anything similar or a syntax that could use to obtain such an output?  I don't want to perform a REST API on each TestPlan or TestPhase to obtain the information.  I want to perform just one request.