You'll need to write a custom field type add-on to do that, but I'd strongly recommend using one of the addons in the marketplace that can do it. Script Runner can do scripted fields, and it's the only one I'm familiar with. You may find others suit you better though.
It's officially Tuesday, which means it's officially time for another tip to help you better navigate this space we call the Atlassian Community. 😄 I got a great question from community member, Sa...
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