a.swift

struct ContentView: View {
    @ObservedObject var entity: MyEntity

    var body: some View {
        NavigationView {
            VStack {
                Text("asdfasdf \(entity.name!)")
                Button("btn") {
                    self.entity.name = "kkkkkkkk"
                }
                
                NavigationLink(destination: ContentView(entity: entity)) {
                    Text("jump")
                }
            }
        }
    }
}