Since October 2022 you can configure Description Templates by Project and IssueType with no Jira Admin intervention!
Download from Atlassian Marketplace —> https://marketplace.atlassian.com/apps/1218223/description-templates-for-jira-cloud?hosting=cloud&tab=overview
Usage: Description Templates by Project and IssueType
Since October 2022, we have released a new powerful feature! Templates by Project with no Jira Admin intervention!!
Just create a ticket in your project with summary “TEMPLATE:IssueTypeName”, ex: “TEMPLATE:Bug” and the system will use the description of the ticket for the next created Bugs. You can also define a “TEMPLATE:Default” summary to apply to the rest of IssueTypes.
Is plug’n’play!
Super very easy!!! See the screenshots:


Soon available in Jira Server/Datacenter!!
Mr.Addon by TecnoFor
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