cvreate_userA.yml

--- # create_userA.yml tasks:

- name: Create the "${user}" user
  action: user
          state=present
          name="${user}"
          createhome=yes

- name: Insert authorized_keys for user "$user"
  action: authorized_key
          state=present
          user="${user}"
          key="${pubkey}"

users.yml

--- # users.yml
- name: Create users
  user: root
  hosts: all

  vars:
    users: # This would be in group_vars
     - alice
     - bob
    userdefs: # This would be a shared list
      alice:
        pubkey: sdfjwkfuqwerw
        # More attributes here....
      bob:
        pubkey: ajdfhUHFWJWRWE
        # More attributes here....
 
  tasks:
    - include: create_userA.yml user="${item}" pubkey="${userdefs.${item}.pubkey}"
      with_items: ${users}