Now look at this.
It even works with a counter:
Isn’t this amazing?
To get to this dialog, open a symbol i the symbol editor and then edit it’s properties.
Symbols Editor / Edit / Properties
Also, if you do such things you have to be aware that KiCad’s own libraries are read-only. This means you also have to learn some library management. I suggest you first make a project specific library, then copy the symbols you want to modify into it and then modify them to your hearts most secret desires.
For more about Library management:
https://forum.kicad.info/search?q=library%20management%20category%3A19