Simulink Level 2 S function, define port name

I would like to assign port names to input and output ports of a Level 2 S function and then use them while the output or update function is called.

But when i try to do that in the setup method by below code then it gives error saying the port name is readonly. I tried creating mask in simulink and then check the portname in update function callback but it gives me back a empty character vector. How can i do that ?

function setup(block)
  
  block.NumDialogPrms  = 1;
  
  %% Register number of input and output ports
  block.NumInputPorts  = 0;
  block.NumOutputPorts = 1;

  %% Setup functional port properties to dynamically
  %% inherited.
  block.SetPreCompInpPortInfoToDynamic;
  block.SetPreCompOutPortInfoToDynamic;
  block.OutputPort(1).Dimensions        = 1;
  block.OutputPort(1).SamplingMode = 'Sample'; 
  block.OutputPort(1).Name = 'Test';