ha_cluster_test.yml

- hosts: localhost
  vars:
    nodenames: [node1, node2, node3]
  tasks:
    - name: add nodes
      add_host:
        name: "{{ item }}"
        foo: bar
        ha_cluster:
          node_name: "{{ item ~ '-ha' }}"
      when: item != 'node2'
      loop: "{{ nodenames }}"

    - name: add node2
      add_host:
        name: node2
        foo: bar

    - debug:
        msg: ansible_play_hosts_all {{ ansible_play_hosts_all }} hostvars {{ ansible_play_hosts_all | map('extract', hostvars, ['ha_cluster', 'node_name']) | map('default', inventory_hostname) | list }}