SharedViewModelExample.kt

class CounterViewModelFactory(val name: String) : ViewModelProvider.Factory {
        override fun <T : ViewModel?> create(modelClass: Class<T>): T {
            return CounterViewModel(name) as T
        }
    }

//inside activity
val viewModel: CounterViewModel by lazy {
        ViewModelProvider(
            MainActivity@ this,
            CounterViewModelFactory("shared")
        )[CounterViewModel::class.java]
    }
  
//inside fragment
val viewModel: CounterViewModel by lazy {
        ViewModelProvider(
            requireActivity(),
            CounterViewModelFactory("shared")
        )[CounterViewModel::class.java]
    }