How to get user email by user's UID from firebase?

I have a customer list page in flutter android, and I already updating registered users with firebase documents about their information, But I need to show a user’s Email by his/her UID. because I’m not putting email and password in their docs.

can flutter and firebase do this? or should I put email and password in the docs as well?

as far as I get, is getting the email of the current user logged in.

FirebaseAuth.instance.currentUser!.email.toString()

can we flutter firebase just like,

FirebaseAuth.instance.getEmailOf(thisUserUid) ???