test.yml

---
- name: testing vars_files start
  hosts: localhost
  user: root
  gather_facts: false
  vars_files:
    - vars.yml
  vars:
    type: "var_from_vars"
  tasks:
  - include: testl1.yml type="{{ type }}"
  - name: test type in playbook
    debug: msg="{{ type }}"

testl1.yml

---
- include: testl2.yml type={{ type }}
- name: test in first level include
  debug: msg="{{ type }}"

testl2.yml

---
- name: test in second level include
  debug: msg="{{ type }}"

vars.yml

---
type: "var_from_file"