Authenticate using email ID not by domain

I am trying to enable google oauth for grafana login. I am able to configure the same for domain but how can we restrict using email of user with google oauth ?

Below is the configuration I added in grafana.ini

enabled = true
client_id = CLIENT_ID
client_secret = CLIENT_SECRET
scopes =
auth_url =
token_url =
allowed_domains =
allow_sign_up = true