Hey Daan Hoving Thank you for your feedback and adding this request.

There is currently a way to do this at the bottom of each event type. If you scroll down to the bottom you will see there is an appointment reminder option, then click the merge tags and you'll see the date and time options there.

I just tested using those short codes in a regular workflow email, and they do not work there yet, just so you are aware, I already tried that.

This request can be refocused to getting those merge tags working in a workflow email. For that purpose, we'll be sure to keep this open for others to vote on and for our dev team for review.

I hope this helps!