MyViewModel.kt

class MyViewModel : ViewModel() {

    @get:MainThread
    val users: LiveData<List<String>> by unsafeLazy {
        MutableLiveData<List<String>>().apply { loadUsersInto(this) }
    }

    private fun loadUsersInto(liveData: MutableLiveData<List<String>>) {
        // do async operation to fetch users and update
    }
}