You can always challenge individual friends to a game and make your decision based on nationality.
However there are plenty of strong players in those whitelisted countries you mention as well and your rating or winrate is not going to significantly change as a result of choosing opponents on nationality.
Hi there, I for one am fed up of getting absolutely destroyed by people from third world countries who have nothing else to do but practice chess all day. I would like to only play people from the United Kingdom, United States, Canada, Australia etc.
Is it possible that we can search opponents by nationality? Or, alternatively, can we have a feature to not play opponents from India, Indonesia, Malaysia etc?