Is that possible to use Variable-Size Data in stateflow

I need a Variable-Size parameter in my Stateflow because I only know it's size at the end of the whole process, during this process now data are continually being added into this Variable-Size Parameter.

Is that possible to use Variable-Size Data in Stateflow(to use 'ones' or 'zeros' function in Stateflow), or are any other methods to achieve this purpose?

Just like in MATLAB(I don't know what is the size of A at the beginning of this process):

n = 1;B = [1 0 0 0 1 0 ...];
for i = 1:100
  if B(i) == 0
     A(n) = 1;
     n = n +1;
  end
end