How can I show my country next to my name in Apple Arcade to an opponent?

Hello, I am very happy with the new games added to Apple Arcade. That includes Chess.com to play quick games with random people worldwide.
When I play, I am able to see the country of my opponent by the flag next to their name. However in my name it shows an international flag. I would like to show my country to (Mexico :mexico:).
How can I set this up? or perhaps opponents already see my flag and I am not aware?
Thank you if you know the answer

Captura de Pantalla 2021-04-12 a la(s) 10.33.45