Red Hat Ansible Tower - passing vars from one playbook to another in the workflow

01-pb.run_tasks.yml

---
  - name: 01 | Run Normal Tasks
    hosts: all
    gather_facts: no
    vars:
      ansible_connection: local
    tasks:
      - debug: var=vars
      
      - name: 01.1 | FACT >> Set Status
        set_fact:
          _failed_status: 'not_set'

      - name: 01.2 | Debug >> FAIL for rhel01
        debug:
          msg: "{{ inventory_hostname }}"
        failed_when: " 'rhel01' in inventory_hostname "

      - name: 01.3 | Debug >> FAIL for rhel02
        debug:
          msg: "{{ inventory_hostname }}"
        failed_when: " 'rhel02' in inventory_hostname "

      - name: 01.4 | Set Flag
        set_fact:
          _failed_status: 'pass'

02-pb.notify_slack.yml

---
- name: 02 | Create in-memory Group
  hosts: all
  gather_facts: no
  tasks:
    - debug:
        msg: "{{ _failed_status }}"
    
    - name: 02.1 | Create In Memory Group
      add_host:
        name: "{{ item }}"
        group: 'failed_hosts'
      when: hostvars[item]._failed_status != 'pass'
      loop: "{{ play_hosts }}"


- name: 03 | Send SlackNotify
  hosts: failed_hosts
  gather_facts: no
  vars:
    ansible_connection: local
  tasks:
    - name: 03.1 | DEBUG >> Output all Hosts
      debug:
        msg: "{{ inventory_hostname }}"

    - name: 03.2 | Test Slack
      slack:
        username: 'AWX'
        msg: "Failed Notification for Host {{ inventory_hostname }}"
        token: "11111111111111111111111111111111111111111111"