How to tell SwiftUI views to bind to nested ObservableObjects

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Nested models does not work yet in SwiftUI, but you could do something like this

class SubModel: ObservableObject {
    @Published var count = 0
}

class AppModel: ObservableObject {
    @Published var submodel: SubModel = SubModel()
    
    var anyCancellable: AnyCancellable? = nil
    
    init() {
        anyCancellable = submodel.objectWillChange.sink { [weak self] (_) in
            self?.objectWillChange.send()
        }
    } 
}

Basically your AppModel catches the event from SubModel and send it further to the View.

Edit:

If you do not need SubModel to be class, then you could try something like this either:

struct SubModel{
    var count = 0
}

class AppModel: ObservableObject {
    @Published var submodel: SubModel = SubModel()
}

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