Project zones

I would want to setup project zones in my calendar. Meaning that I can say on 9-15 I want to work only on work topic while on 15-20 I want to work on private topic for example. I know this is similar to time slots but timeslots are just buckets of multiple tasks not rules. This would also be very helpful for the AI. So I could simply say plan my day and instead of cleaning the kitchen being on the middle of the workday it then can only be scheduled in the designated time.