I'm trying to combine the notification templates and schemes so that we can have custom email notifications for each board and task.
Out of the box, no. You can have notification for each project but these will follow events, not tasks. If you want, you could create XX different events, place them of your tasks' workflows and then change the who these notifications are going to be send. Email templates in jira server can be changed, if not mistaken, but I'm not sure you can bind them to tasks.
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