To verify, we're talking about the "Releases" aka "FixVersion" section of a Jira project that's visible via an Agile Board?
Unfortunately, today there is not. We're not able to add custom metadata to the Release entity. It also appears to not be a feature available on the marketplace. A similar question was posed here: https://community.atlassian.com/t5/Jira-questions/Is-there-a-way-to-add-a-custom-field-to-a-version-in-the-cloud/qaq-p/604366.
Depending on what kind of metadata you would like to track, there is a plugin (https://marketplace.atlassian.com/apps/1218705/release-management-for-jira?hosting=datacenter&tab=overview) that essentially allows users to add more context to a Release separate from where Release information is stored.
Catch up with Atlassian Product Managers in our 2020 Demo Den round-up! From Advanced Roadmaps to Code in Jira to Next-Gen Workflows, check out the videos below to help up-level your work in the new ...
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