Get AgileTestRunner results in TFS build template

I have a xaml based TFS build that uses the "RunAgileTestRunner" build task to run our unit tests. Later on in that build template I publish the build artifacts into a NuGet package with some information in it about the checkins and the build. I would also like to put some information about the test run (failed vs passed) and code coverage. I can see the overall test success in IBuildDetail.TestStatus but I want slightly more information. Is there a way I can get this data while in the build template? Is it hidden in IBuildDetail somewhere or is there another task I can go to?

I want to really avoid writing c# based activities that use the TFS api as much as possible, I am open to working with a powershell script (maybe in the Run optional script after Test runner) activity, but I dont want to be compiling dll's to upload into source control to reset the agent etc