data_manip_facts.yaml

---
- name: Playbook to mainpulate data
  hosts: localhost
  gather_facts: false
  vars_files:
    - workflows.yml

  tasks:

    - name: Setting workflows
      ansible.builtin.set_fact:
        workflows: "{{ workflow_job_templates | map(attribute='name') }}"
        #inventory_sources: "{{ workflow_job_templates | map(attribute='name') }}"
        #approval_nodes: "{{ workflow_job_templates | map(attribute='name') }}"

    - name: Setting facts
      ansible.builtin.set_fact:
        workflow_nodes: "{{ workflow_nodes | default([]) + [ workflow_item.related.workflow_nodes] }}"
      loop: "{{ workflow_job_templates }}"
      loop_control:
        loop_var: workflow_item

    - name: Setting facts
      ansible.builtin.set_fact:
        data_loop:
          inventory_sources: "{{ inventory_source | default([]) + [ workflow_node ] }}"
      loop: "{{ workflow_nodes }}"
      loop_control:
        loop_var: workflow_node

    - name: Show output
      ansible.builtin.debug:
        var: workflow_nodes
...