"172.23.130.13",
"172.23.130.34",
"172.23.130.99",
"172.23.130.94"

- name: Create Add and Remove Group Batches
  gather_facts: false
  hosts: all
  become: true
  no_log: false
  serial: 2

  tasks:
    - add_host:
        name: "{{ item.1 }}"
        ansible_ssh_port: 2020
        group: loadbalancer-{{ <<serial counter here>> }}
        action: add
      with_indexed_items: "{{ play_hosts }}"
      delegate_to: localhost