Is it possible to create global variables (objects) of custom classes in Simulink?

Hello,

I have a custom class that returns an object of complex data types, such as structs, variable-data type cell arrays, and AppDesigner classes. I am looking to use this object in multiple MATLAB Fcn blocks to call different methods at different points in my simulation.

Previous Attempts:

Base Workspace - tried initializing object in PreLoadFcn callback but it is recognized as undefined in the MATLAB Fcn block

Model Workspace - initialized the object successfully as object of my custom class, but I get the

error: "Expression 'gObj' for initial value of data 'gObj' must evaluate to logical or supported numeric type."

Any suggestions?