Race and Ethnicity in the OMOP CDM

Also going back to this conversation as there is an interest in adding races (such as in this post). Apologies if these questions have been resolved, but:

  1. Do we have a consensus on how to store multiple races?
  2. Do we have a consensus on whether races within the context of a country should be represented as different entities or as one entity? Such as White - US, White - British, White - Australian and so on?

I’m specifically interested in the latter question (Vocabularies perspective). Couldn’t find a convention but may be missing something.