There is an option to be visible on the form or read-only ?

There is an option to be visible on the form or read-only ?

I think you are looking for something similar described on this user guide: 

How-to-Have-Unique-Question-Using-Multiple-Fields

Here is a demo form https://form.jotform.com/62018321419953 you can test.

The unique code can be shown instead and set to read-only.

Let us know if this is not what you need.