Create Postgres DB user using lookup()

postgres_user.yml

- name: Create db users
  postgresql_user:
    login_host: "{{ hostname }}"
    login_user: "{{ db_user }}"
    login_password: "{{ db_passwd }}"
    db: "{{ db }}"
    priv: "{{ db_priv }}"

    name: "{{ item }}"
    password: "{{ lookup('password', playbook_dir + '/' + db + '-' + item.user + '.passwd') }}"
    no_password_changes: yes
  with_items: "{{ db_user_list }}"