Right now, JUNIT reports are not modifiable at all. They are important when comes to running test cases via some CI and host result/report at a url. JUNIT reports are so simple and do not give information about the REQEST/RESPONSE of a failed step to actually look at the reason why the test cases failed on the test server which might run successfully on local. Across various communities, I see that this feature is required by most of the users, a lot of discussion around it, and the way suggested is via maven project which seems to put more effort than writing test cases.
Here you can review submitted feature requests and vote up the ones you like! If you can't find the feature you want - go ahead and suggest your own idea. Ideas with the highest rating can be implemented in the product.