With ScriptRunner is very easy!
IMPORTANT NOTE: YOUR JIRA INSTANCE MUST BE A NON-PRODUCTION SERVER
Go to “Cog icon–>Add-ons–>SCRIPTRUNNER–>Script Fragments–>Click in “enable” phrase”
You will see then the “debug” mode… (more info)
How to know the location to insert a fragment in JIRA
www.MrAddon.com ®: Jira & Confluence Administration Support Blog 
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