jinja.j2

name =  {{ item.name }}
username =  {{ item.username }}

playbook.yml

---
- name: Create my files
  hosts: localhost
  gather_facts: false

  vars:
    jinja_var:
      - name: a
        username: c
      - name: b
        username: d

  tasks:
    - name: Create file from jinja
      template:
        src: "jinja.j2"
        dest: "template_{{ item.name }}"
        owner: "root"
        group: "root"
      with_items: "{{ jinja_var }}"