add_host.yml

    - name: Add instance(s) to my_instances group
      ansible.builtin.add_host:
        name: "{{ item.tags.Name }}"
        ansible_host: "{{ item.public_ip_address }}"
        ansible_user: "{{ ec2_username }}"
        private_ip: "{{ item.private_ip_address }}"
        instance_name: "{{ ec2_resource_prefix }}"
        ansible_ssh_private_key_file: "{{ playbook_dir }}/{{ ec2_resource_prefix }}-private.pem"
        instance_ssh: "{{ ssh_info }}"
        groups:
          - my_instances
      with_items: "{{ ansible_node_facts.instances }}"