ansible.azure.automation/roles/azure_vnet/tasks/list.yml

---
- name: Get virtual network
  azure_rm_virtualnetwork_facts:
    ad_user: "{{ azure_ad_user | default(omit) }}"
    password: "{{ azure_password | default(omit) }}"
    subscription_id: "{{ azure_subscription_id | default(omit) }}"
    client_id: "{{ azure_client_id | default(omit) }}"
    secret: "{{ azure_secret | default(omit) }}"
    tenant: "{{ azure_tenant | default(omit) }}"
    resource_group: "{{ vnet.resource_group | default(omit) }}"
    tags: "{{ vnet.tags | default(omit) }}"
    name: "{{ vnet.name | default(omit) }}"
  register: azure_vnet_facts

- name: Print virtual network
  debug:
    var: azure_vnet_facts.virtualnetworks
...