使用SwiftUI / Combine，如何避免在ViewModel中放置可取消标签

import SwiftUI
import Combine

class ViewModel: ObservableObject {
    private var cancellables = Set<AnyCancellable>()
    
    func fetchData() {
        // 使用Combine进行网络请求
        URLSession.shared.dataTaskPublisher(for: URL(string: "https://example.com")!)
            .map { $0.data }
            .decode(type: MyData.self, decoder: JSONDecoder())
            .sink { completion in
                // 处理请求完成的情况
            } receiveValue: { data in
                // 处理请求成功的情况
            }
            .store(in: &cancellables) // 将订阅添加到Set中
    }
    
    func cancelSubscriptions() {
        cancellables.forEach { $0.cancel() } // 取消所有订阅
    }
}

struct ContentView: View {
    @StateObject private var viewModel = ViewModel()
    
    var body: some View {
        Text("Hello, World!")
            .onAppear {
                viewModel.fetchData()
            }
            .onDisappear {
                viewModel.cancelSubscriptions()
            }
    }
}