Hello @Pertti Oinonen
Thank you for reaching out.
Just like all the other issue types in JIRA, Sub-task notifications are also based on the Notification scheme of the related project.
Unfortunately, it's not possible to change or add any fields to the notification template using the default JIRA UI, however, we understand how useful this feature would be. That being said, we created the following feature request to get it implemented:
Feel free to vote and watch the suggestion to increase its priority and also receive notifications about any updates.
As a workaround, you can change the velocity templates in JIRA server to customize your notification template or use a third-party app as the notification manager instead of JIRA, like Enterprise Mail Handler (JEMH).
Please, check the documentation below to know how you can edit the Velocity templates of your JIRA application:
If you want the option using a plugin, please take a look at the comments of the feature request to get more details about the plugins and what would better fit for your scenario.
Let me know if this information helps.
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