MVVM plugin pattern simple example using Puzzle Template.
https://dev.epicgames.com/documentation/en-us/unreal-engine/umg-viewmodel-for-unreal-engine
User -> Interacts with UI -> Widget sends update back to bound MVVM variable ->ViewModel sends update back to actor/game object.
Actor/Game object sends changes to variables in MVVM -> ViewModel updates bound variables using FieldNotify -> Widget displays updated information to user.