如何在Ansible 2.7或2.8中循环遍历多级字典或yaml？

users:
  alice:
    name: Alice
    age: 30
    roles:
      - admin
      - developer
  bob:
    name: Bob
    age: 25
    roles:
      - user
      - tester
  charlie:
    name: Charlie
    age: 35
    roles:
      - manager

# data.yml
users:
  alice:
    name: Alice
    age: 30
    roles:
      - admin
      - developer
  bob:
    name: Bob
    age: 25
    roles:
      - user
      - tester
  charlie:
    name: Charlie
    age: 35
    roles:
      - manager

# playbook.yml
- name: Loop through multi-level dictionary
  hosts: localhost
  gather_facts: no
  vars_files:
    - data.yml
  tasks:
    - name: Loop through users
      debug:
        msg: "User {{ item.key }}: Name={{ item.value.name }}, Age={{ item.value.age }}, Roles={{ item.value.roles | join(', ') }}"
      with_dict: "{{ users }}"

ansible-playbook playbook.yml

PLAY [Loop through multi-level dictionary] ******************************************************************

TASK [Loop through users] ***********************************************************************************
ok: [localhost] => (item={'key': 'alice', 'value': {'name': 'Alice', 'age': 30, 'roles': ['admin', 'developer']}}) => {
    "msg": "User alice: Name=Alice, Age=30, Roles=admin, developer"
}
ok: [localhost] => (item={'key': 'bob', 'value': {'name': 'Bob', 'age': 25, 'roles': ['user', 'tester']}}) => {
    "msg": "User bob: Name=Bob, Age=25, Roles=user, tester"
}
ok: [localhost] => (item={'key': 'charlie', 'value': {'name': 'Charlie', 'age': 35, 'roles': ['manager']}}) => {
    "msg": "User charlie: Name=Charlie, Age=35, Roles=manager"
}

PLAY RECAP **************************************************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=0