Use Expressions or Constants in Email Events

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I built some workflows which will input full or sample data in multiple Input Data tools based on changing the value of a user constant. These workflows have email events enabled after run.I want to change the email subject based on whether the workflow ran in full or sample mode. That's my use case. I know that I could do this using the Email tool and that's not going to work in my use case. If the workflow fails, there won't be an email. Also, I don't know if the Email tool is blocked by just my Gallery or by all Galleries.

To generalise this, I want to dynamically change email event subjects, bodies, and more by either using expressions/constants from the workflow or by having an expression editor directly in the event itself.

Thank you.