How to pass structures and strings to Level-2 S-Function?

Hello all,

I am pretty new to SIMULINK. I am trying to convert the code I have in matlab to simulink models. I create one level-2 S-Function for each of my matlab functions. How can I pass structures (which have non-numeric fields, function calls, etc) and strings from one Level-2 s-function to another level-2 s-function?

I tried Data Store Memory, but it seems it only supports numeric data types.

Thanks.