As long as the doll is not a caricature, and sensitively modelled then it is not an issue. The doll represents a baby human, that is all.
The intention is the important thing - and by giving your child such a doll you are positively educating him/her about the variety of all people in the world.
I have seen excellent dolls of various heritages, with Down syndrome, even hearing aids, glasses, stomas! Check out Miniland's dolly range, they are so cute https://minilandgroup.com/educational/en/dolls-accesories/
I am married to someone from Asia and have a family of various shades, creeds and abilities. The more little children are taught that we all look or sound different the better.