# vars/passwords
---
passwords:
  - foobar: pass1234

# defaults/main.yml
users:
  - username: foobar
    group: barfoo
    password: "{{passwords.foobar}}"

# tasks/main.yml
- include_vars: passwords.yml

- name: Create user
  user:
    name: "{{item.username}}"
    group: "{{item.group}}"
    password: "{{item.password | password_hash('sha512') }}"


ERROR:
{
    "msg": "[{u'username': u'foobar',
     u'group': u'barfoo',
     u'password': u'{{passwords.username}}'}]: 'list object' has no attribute 'username'"
}