Ability to create custom fasting timers/trackers

Unlike other fasting apps, Yazio doesn't allow the user to make a fully custom fasting timer/program/tracker. For example, like many other people who fast regularly, I like to do a full 7 day water fast every 3 months. I would like to have the ability to create my own fasting tracker and timer were I can customize it to any length in time or split I'd like rather than only be able to choose from the trackers currently available in the app. This would allow the user to be able to create and keep track of their own fasting tracker and timer while being able to choose whatever fasting split they please. Other apps already have this, as a paid user it's disappointing to see that I can only select from the limited list of trackers and programs currently in the app.