I am glad to know that. You cannot directly get the scattering coefficients without digging through the code more in depth. The coefficients are labeled as b_n, c_n in getDielectricSphereFieldUnderPlaneWave.m
This code is primarily written for visualization, but not for further post-processing. A word of caution is that you need to make sure that these coefficients are normalized properly if you want to calculate the scattering efficiency.
The reference [Pena2009] is a good place for this kind of calculation.