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

---
- name: Build tags list
  set_fact:
    tags_list: "{{ tags_list | default([]) | union([[tag.key,tag.value]|join(':')]) }}"
  loop: "{{ lookup('dict', rt.tags | default({})) }}"
  loop_control:
    loop_var: "tag"

- name: Get route table
  azure_rm_routetable_info:
    ad_user: "{{ azure_ad_user | default(omit) }}"
    password: "{{ azure_password | default(omit) }}"
    subscription_id: "{{ rt.azure_subscription_id | default(lookup('env', 'AZURE_SUBSCRIPTION_ID')) }}"
    client_id: "{{ azure_client_id | default(lookup('env', 'AZURE_CLIENT_ID')) }}"
    secret: "{{ azure_secret | default(lookup('env', 'AZURE_SECRET')) }}"
    tenant: "{{ azure_tenant | default(lookup('env', 'AZURE_TENANT')) }}"
    resource_group: "{{ rt.resource_group }}"
    tags: "{{ tags_list | default(omit) }}"
    name: "{{ rt.name | default(omit) }}"
  register: azure_rt_facts

- name: Print route table
  debug:
    var: azure_rt_facts.route_tables
...