Hi Samuel and Chris.
Currently this option is not available on GH 6, although there is a Story regarding to this:
https://jira.atlassian.com/browse/GHS-4949
I would advise you to add the issue on your watch-list and also to vote, comment to increase its popularity.
This doesn't quite answer your question, but if you're not already aware, the following JQL queries are supported:
I too would like to see a way to query by sprint name.
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