get the indices in a C++ mdspan from a reference by arithmetic

Question

#include <https://raw.githubusercontent.com/kokkos/mdspan/single-header/mdspan.hpp>
#include <vector>
#include <algorithm>
#include <iostream>
#include <ranges>

int main(){
    std::vector vec = {1, 2, 3, 4, 5, 6, 7, 88, 9, 10, 11, 12};
    auto ms = std::mdspan(vec.data(), 2, 6);

//given the indices in the tensor, get the position in contiguous memory
    {
        const int position = std::distance(vec.data(), &ms[1, 3]);
        std::cout << position << '\n';
    }
//given the position in contiguous memory, get the indices in the tensor by direct access ?
    {    
        const int position = 9;
        //I wanted to avoid doing the arithmetic myself ? something like auto [i, j] = ms.indices_from_pos(position) ?
    }
}