How to create a mask of the input and output ports with simulink/matlab?

When creating a mask on top of the input or output ports, I promote all the underlying parameters because I want the port number to be displayed and have access to other parameters. The goal of the mask is to add other parameters such as Unit and Description in the input or output port. However, as soon as all the underlying parameters are promoted, the input port block lose its dynamic behaviour, meaning that it does not increment or decrement anymore when copied pasted. I would like to have a block similar to the original input/output port blocks but with additional parameters such as description and unit. Is there a way to do that? I have been struggling with that the past few days...

Thank you very much

Vincent