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

---
- name: Get vm extension
  azure_rm_virtualmachineextension_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: "{{ vmext.resource_group }}"
    tags: "{{ vmext.tags | default(omit) }}"
    name: "{{ vmext.name | default(omit) }}"
    virtual_machine_name: "{{ vmext.vm_name }}"
  register: azure_vmext_facts
  failed_when: false

- name: Print vm extension
  debug:
    var: azure_vmext_facts.extensions
...