for frdm-k22f it should be ready in Release 3, which is expected in mid of july.
You can see printer example in other devices, for example if you download package for frdm-kl25z there is USB virtual printer application ready with related usb device config and printer files.
I hope this helps you.
In case of any questions, please let me know.
Fantastic, thank you. Any chance we can get beta access? Our team has been finding a few bugs in the latest release; we could definitely provide you with quick feedback on regressions.