loop_on_object.yml

---
- hosts: lb
  user: root
  vars:
    somelist: ["testuser1", "testuser2"]

  tasks:
    - name: add several users
      user: name={{ item.name }} state=present groups={{ item.groups }}
      with_items:
        - { name: 'testusera', groups: 'wheel' }
        - { name: 'testuserb', groups: 'root' }