Example Provision & Target

pseudo.yml

- hosts: localhost
  connection: local
  tasks:
    - name: provision some shit
      whatever_module:
         ...args
      register: new_hosts
     
    - name: add hosts to in-memory inventory
      add_host:
      ## you can literally add any var value here and it will get translated as a host var 
        hostname: "{{ new_hosts['something_resolvable'] }}"
        ansible_port: "{{ whatever_port }}"
        groups:
          - new_hosts

- hosts: new_hosts
  tasks:
     ...do stuff