Ansible: Can we run an include playbook Asynchrono

I'm interested to learn if Ansible can run an included playbook asynchronously?

Basically what I'm trying to do is run a task "Fire and forget, check on it later." When I check on it later I also want to send a slack notification with the result.

However I've notice the included playbook for slack notification takes a little longer than expected to complete and hence it holds up the rest of the playbook.

What I want is to async the included playbook for slack notification so that the current playbook continues.

For instance I have a playbook.yml file that looks like:

- hosts: localhost

  tasks:
  - name: Fire and forget task
    shell: some_task.sh
           chdir=/tmp/
    register: fire_and_forget_task
    async: 3600
    poll: 0


  - name: Check on fire and forget task
    async_status: jid={{ fire_and_forget_task.ansible_job_id }}
    register: task_status
    until: task_status.finished
    retries: 100
    ignore_errors: yes


  - name: Send slack success msg
    include: slack.yml msg="Fire and forget task SUCCESS"
    when: task_status.stdout is defined and 
          'SUCCESS' in fire_and_forget_task.stdout
    async: 3600
    poll: 0


  - name: Send slack failed msg
    include: slack.yml msg="Fire and forget task FAILED"
    when: task_status.stdout is defined and 
          'FAILED' in fire_and_forget_task.stdout
    async: 3600
    poll: 0

My slack.yml file looks like:

  - name: Send notification message via Slack
    local_action:
      module: slack
      token: <REDACTED>
      attachments:
      - text: "{{ msg }}"
        color: "#83F52C"
        title: "Ansible Status {{ lookup('pipe','date') }}"

With the above playbook, the "Send slack success msg" task takes an awfully long time to execute for a simple task like that. It seems its not running asynchronously even though I have explicitly stated it should.

What is the best way to achieve the desired outcome? Thank you.

include can't use async keyword.
If your slack.yml is that simple, just replace your include stuff with a single call:

- name: Send notification message via Slack
  local_action:
    module: slack
    token: <REDACTED>
    attachments:
    - text: "Task result {{ (task_status.stdout is defined and 'SUCCESS' in task_status.stdout) | ternary('SUCCESS','FAILURE') }}"
      color: "#83F52C"
      title: "Ansible Status {{ lookup('pipe','date') }}"
  async: 3600
  poll: 0

P.S. but I don't understand how is single Slack HTTP-call slowing down your playbook if you have a long-running task (with high async and retries numbers) just before it...