It actually took me six days before I figured out how to approach the logic related with levels completion popups. Luckily a week consists of seven days, that is why the last one was the productive one.
Swift Charts for me was the shining star of The WWDC 22 week. Surprisingly, for this week I also planned adding little chart to the app presenting in the list progress in completing goal levels. As the app is for now developed based on SwiftUI in version for iOS15, I did not have the opportunity to test Swift Charts, but I believe I'll use it slightly later. Thanks to modularity of the code it shall be super easy to replace current chart rendering with SwiftUI code.
Creating goals without defining levels you wanna achieve is like participating in race without a finish line. Goal levels are checkpoints clearly showing you if you actually progress. There is no simpler and better way to monitor your progress.