I don't think you're going to be able to, not in an OD environment. You need to modify some embedded templates.
Yes, you take the included plugins in a file called atlassian-bundled-plugins.zip in the Jira install, extract it, find the relevant plugin, extract that, modify the template. Re-pack the plugin, repack the original ZIP file, then restart Jira. You can only do this if you have Jira locally installed and you'd have to re-do it every single time you upgraded Jira. Not an approach to take unless you know what you are doing
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