I'm having trouble understanding best practices around the liveData builder function. Is one of these example incorrect? If not, what guidelines would help me pick whether to build the LiveData in my ViewModel layer vs my repository layer?

Coroutines LiveData organization

class MyViewModelOne(private val dataRepositoryOne: DataRepositoryOne) : ViewModel() {

    fun fetchDataButtonClicked() = liveData { 
        emit(dataRepositoryOne.fetchData())
    }
}

class DataRepositoryOne(private val webInterface: MyWebInterface) {
    suspend fun fetchData() = webInterface.fetchWebData()
}

class MyViewModelTwo(private val dataRepositoryTwo: DataRepositoryTwo) : ViewModel() {

    fun fetchDataButtonClicked() = dataRepositoryTwo.fetchData()
}

class DataRepositoryTwo(private val webInterface: MyWebInterface) {
    fun fetchData() = liveData {
        emit(webInterface.fetchWebData())
    }
}

interface MyWebInterface {
    // this is probably a Retrofit interface
    suspend fun fetchWebData(): List<String>
}