Ansible loop output in one file

output.yml

    - name: Save output
      ansible.builtin.copy:
        content: |-
          {% for host in ansible_play_hosts_all %}
          {{ '### ' }}{{ host }}{{ ' ###' }}
          {{ hostvars[host]['result']['stdout_lines'] | to_nice_json }}
          {% endfor %}
        dest: output.log
        mode: "0644"