As far as I know, the term chromatic doesn't have a specific regional origin -- or rather regional usages. I should have been clearer, but the term gains significance and momentum in recent years mostly online and it's used internationally, U.S. American non-white/people of color among them, yes, but not limited.

dark_agenda explores and celebrates both chromatic/non-white/characters of color (e.g. Korean descent characters living in Korea, Japan, Brazil, U.S.A.) and chromatic/non-white and non-Western cultures (e.g. portrayals of Korean cultures in Korea, Japan, Brazil, U.S.A.). I'm not sure I understand why issues with regarding to race and ethnicity can't also be related to issues of cultures? I'm not also sure I understand the insistence on labeling issues regarding race/ethnicity/culture to be solely about skin color? As if chromatic/non-white/people of color who identified themselves as such differentiate themselves (solely) based on skin color?