This is currently not possible, however there is an existing feature request for it:
I encourage you to vote on the feature request ticket to increase its popularity and add yourself as a watcher to be kept informed of progress going forward. For more details on how Atlassian handles and prioritizes new feature requests, please refer to the Implementation of New Features Policy: https://confluence.atlassian.com/support/implementation-of-new-features-policy-201294576.html
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