create_users_json.yml

---
- name: Create users.json
  hosts: localhost

  tasks:
  - name: Check if users.json exists
    ansible.builtin.stat:
      path: users.json
    register: register_stat_users

  - name: Create users.json
    ansible.builtin.command: /bin/bash users.sh 500
    when: not register_stat_users.stat.exists