I haven't told anyone except my closest friends, and a few guys who were persistent in asking me out on a date.
It's not due to shyness or anything. It just hasn't come up. The closest thing I've come to the topic is when my mom and I talked about women having grandchildren and I was
curious how she'd feel if none of us kids had any children. If she'd be dissapointed. She said she wouldn't be and she'd totally respect our choices if we decided not to have any. I'll probably tell them at some point though. They'd be interested to know.
I agree with you who posted about coming out would be good just to spread the word to people who are aromantic without knowing that's a thing. Think how lucky we are to be born in a time of internet.