Not that I am Aware of. I would recommend reaching out to Dynatrace support chat who can look into this deeper. The User Session Query language is limited and can be viewed as its own Dynatrace Language.
It is not currently possible to rename results from a USQL query. If this is a feature that you would like to see added to Dynatrace, I suggest creating an RFE here: https://answers.dynatrace.com/content/idea/post.html?space=483 so this idea can be seen by the product team.