The Qt's equivalent is QVariant
(easy to guess). This pseudo code illustrates its abilities you may need:
QVariant va_array = some_function();
QVariantList array = va_array.toList();
int dimension1 = array.count();
int dimension2 = 0;
if (dimension1 > 0) {
dimension2 = array[0].toList().count();
}
int i = 42, j = 24;
double array_item = array[i].toList()[j].toDouble();