Tap reminder to mark as complete.

Since the dropdown menu of the calendar widget does not have an option to check a task as completed, I am trying to create a work-around with applescript. I tried to call a named trigger and use some applescript to mark the event as complete, but unfortunately, I can't seem to figure out how to parse the applescript the {{eventTitle}}'s as strings. Does BTT have this functionality? Is is more viable to implement this on the back-end?

Images for reference.

Any help or direction appreciated!