Currently, this functionality is not available on Jira.
We have a suggestion for this ability to be implemented in the future:
Please, click on Vote and Watch to receive updates about the feature.
I'm sorry that we can't be more helpful on it.
If you have any other question, please let us know.
there is a brand new App called "ReVitalized Issue Collector for Jira" in Atlassian Marketplace, it adds the Google reCAPTCHA feature for better security and anti spam to any existing issue collector.
And in addition you can style the Form with your own CSS.
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