bench new-site: add extra options to provide PostgreSQL username and password

I am trying to create a SAAS using frappe and while creating a new site I don’t have an option to provide a PostgreSQL username and password in the bench new-site command. So is there any ways that we can achieve this else please provide us in future releases.

Please provide us options similar to --mariadb-root-username and --mariadb-root-password for postgres.