handler-include-loop.yml

---
- hosts: all
  gather_facts: no
  tasks:
    - debug:
        msg: "First host: {{ groups['x']|first }}"
      changed_when: true
      notify:
        - include when loop item is inventory_hostname

  handlers:
    - name: include when loop item is inventory_hostname
      include_tasks: include.yml
      when: inventory_hostname == item
      loop: "{{ groups['x'] }}"