Oh I didn't see you were running Jira Server. You need Automation for Jira to build this rule, it is included with Jira Cloud and Jira Data Center.
If the app is already installed on your Jira Server, you can create this rule by going to Project settings > Project automation.
We know that great teams require amazing project management chops. It's no surprise that great teams who use Jira have strong project managers, effective workflows, and secrets that bring planning ...