That's not really possible.
Jira's search finds issues. Not versions. So you can find issues with unreleased versions, but not the versions themselves. Two tricks though:
1. Use the advanced JQL search, and look for the "help" icon. Then look for JQL functions, and if you're on a later version of Jira, you'll find functions that can help you filter for released/unreleased
2. Once you've got a good filter for issues, try using it on a dashboard. The easy example is to put the filter through a "filter statistics" gadget, and select "version" as the grouping statistic. This will give you a bar chart listing versions and the number of issues in them. Which is close to what you need!
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