如果不存在，如何创建组并动态添加主机

如何解决如果不存在，如何创建组并动态添加主机

我有一个特殊要求，当条件满足时将主机名添加到组中（如果该组不存在，我也需要创建该组），该组将在另一场比赛中传递，

# check if other side os is running on this host
- set_fact:
    other_pair_host: "{{ inventory_hostname | regex_replace('ha','hb') }}"
  when: (inventory_hostname | regex_search('^.+ha.+$') )
- set_fact:
    other_pair_host: "{{ inventory_hostname | regex_replace('hb','ha') }}"
  when: (inventory_hostname | regex_search('^.+hb.+$') )
- name: check other side host is running
  set_fact:
    other_side_running: "{{ other_pair_host in groups['reachable_other_pairs'] }}"
  when: check_other_side_running == true

# if 'check_other_side_running' is set to false means we are on B side installation and we have already validated
- set_fact:
    other_side_running: true
  when: check_other_side_running == false

现在我需要创建和主机组说'failed_hosts'。像这样：

- set_fact:
    host: inventory_hostname
  when: check_other_side_running == false
- group_by:
    key: "reachable_other_pairs"

不确定如何正确执行此操作。

添加后，我将在另一个游戏中使用这个组，如下所示

- name: Install on failed hosts
  hosts: failed_hosts
  connection: local
  gather_facts: no
  roles:
    - Juniper.junos

有人可以就此提出建议吗？