It would be nice to have the jshint reporter option available as part of the grunt task. This could then be used in CI like jenkins to display checkstyle reports.
It would be very nice, but the way the jshint cli is written makes it pretty much impossible to utilize that built-in functionality. Also, even if the task were to output xml, grunt itself outputs a lot of non-xml, which means you'd probably have other issues to deal with.
I'm not sure what can be done to help with this.