Creating an automation stitch that emails only on specific logs

So I know how to create an automation stitch and configure it to send email when triggered.
I need to configure a trigger on a specific task, which I can't find a specific trigger for, and can't find a trigger that I can customize to perform what I want.
I need a trigger that will send an email when a certain deny policy is used. All that I can find is the general traffic violation, which will trigger every deny policy that is present on Fortigate, while I just need the trigger to work when a certain policy is used, not all policies.
Is this doable on Fortigate, and if not, is there any work around to do the same function?
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