Using model, trained with Regression Learner App, in Simulink.

I have trained a model in Regression Learner App in Matlab, this app has generated a prediction function (fcn()) that is inide a struct (trainedmodel.fcn). I need to use this prediction function in Simulink. Is there any way to implement this?

I have tried using Matlab Function in Simulink but it does not recognize fcn inside struct.