Is it possible to interpolate several different variables at the same time?

#include <mba.hpp>

int main() {
// Coordinates of data points.
std::vector<mba::point<2>> coo = {
{0.0, 0.0},
{0.0, 1.0},
{1.0, 0.0},
{1.0, 1.0},
{0.4, 0.4},
{0.6, 0.6}
};

**// Data values.
std::vector<double> val = {
    0.2, 0.0, 0.0, -0.2, -1.0, 1.0
};**

// Bounding box containing the data points.
mba::point<2> lo = {-0.1, -0.1};
mba::point<2> hi = { 1.1,  1.1};

// Initial grid size.
mba::index<2> grid = {3, 3};

// Algorithm setup.
mba::MBA<2> interp(lo, hi, grid, coo, val);

// Get interpolated value at arbitrary location.
double w = interp(mba::point<2>{0.3, 0.7});

}

I mean, if for example in the example of the introduction the variable "val" could be an array with different variables to interpolate instead of a vector that only has space for one variable (regardless of how long it is).

I know that the algorithm can be initialized with the different variables, but if it could be initialized with all the variables to interpolate at the same time, it would be more optimal, I think, can this be done?