- name: Collect information
  shell: |
    echo '{"name": "Test", "msg": "Do the real thing here"}' ||  echo "FAILED" >&2
  check_mode: False
  register: last_result
  changed_when: False
  failed_when: "last_result.stderr_lines | length > 0"

- name: Add to list if name does not exist
  set_fact:
    list_of_information: "{{ list_of_information + [ item ] }}"
  loop: "{{ last_result.stdout_lines | from_json }}"
  when: "item.name not in list_of_information | map(attribute='name')"