According to my understanding you want to access the entity attributes in MATLAB. To do this, You may save the entity attributes to MATLAB workspace using “assignin” and then pass it as one of the input arguments to the function as you mentioned.
You can save the entity attributes to MATLAB Workspace by calling the following code in the event actions of a SimEvents Block:
assignin('base', 'out’, entity);
“out" is the variable in workspace where the values of entity are saved.