Add “Goals” category to calendar

For the calendar, I would like the ability add a goal that can be checked off as “completed “ similar to a workout. For example, I’m trying to drop a few pounds. Each night this week I have a goal not to eat after 9:00 pm. I have been using the annotations feature, but it would be nice and would also add some extra accountability if I could check it off and make it turn green, like other activities. Thanks for considering.