file.managed with two appends

append.sls

append my two files:
  file.managed:
    - name: /tmp/myfile.txt
    - source: salt://template.txt
    - template: jinja

myfile.txt

some static content that won't change

here is some more content

{{ pillar.get('first_piece') }}

{{ pillar.get('second_piece') }}

you can even place content after with this example