iterate in a multilist provider

Question

I fetch a future from DB, a List<List> ...each sublist contains 3 variables.

I assign the list to a provider.

  class SomeProvider with ChangeNotifier{
     List<List<dynamic>?>? _fetchedDataList;
     String? _one;
     String? _two;
     String? _three; 
  }

 List<List<dynamic>?>?  get fetchedDataList => _fetchedDataList;
 String? get first => _first;
 String? get one => _one;
 String? get two => _two;
 String? get three => _three;

void setFetchedDataList(List<List<dynamic>?>? theList){
   _fetchedDataList = theList;
}

void setOne(String? one){
 _one = one;
}

in the widget I set the provider :

 providerClass = Provider.of<SomeProvider>(context);
 
 queryDB.then(theFutureResult){
  providerClass.setFetchedDataList(theFutureResult); 
 }

Now...how to iterate through the fetchedDataList to get the values of the variables for each sub list ? cuz I need assign each 3 variables in separate Container's texts the provider get method of each variable.