しらんけどこんなんでいいんじゃない、しらんけど

systemd-timer.yml

- name: set timer
  hosts: all
  become: yes
  vars:
    name: mytimer
    start_exec: /usr/bin/python3 /home/pi/bme280tozabbix.py
    timer:
    - OnUnitActiveSec=1min
  tasks
  - name: copy systemd service file
    copy:
      content: |
        [Unit]
        Description=timer service for {{ name }}
        
        [Service]
        Type=oneshot
        ExecStart={{ start_exec }}
        
        [Install]
        WantedBy=default.target
      dest: /etc/systemd/system/{{ name }}.service
      mode: 0644
  - name: copy systemd timer file
    copy:
      content: |
        [Unit]
        Description=timer for {{ name }}
        
        [Timer]
        {% for l in timer %}
        {{ l　}}
        {% endfor %}
        
        [Install]
        WantedBy=timers.target
      dest: /etc/systemd/system/{{ name }}.timer
      mode: 0644