How to add gpio connected to user defined module in VHDL/Verilog?

[pratipm]

How do I add one or more gpios whose input/outputs are not connected to board pins but act as input/outputs to user defined modules in Verilog/Vhdl? ChatGPT defines one way to do it but that involves manually modifying generated top level Verilog code and I find that not to be a real solution. Thanks in advance.