Structured logging in Salt with `file.append` and `|json`

example.log

{"a": "a value", "c": "c value", "b": "b value"}

example.sls

{% set logline_data = {
    'a': variable_a,
    'b': variable_b,
    'c': variable_c
  }
%}

structured-logging-attempt:
  file.append:
    - name: /var/log/example.log
    - text: '{{ logline_data|json }}'

Without the single quotes around {{ logline_data|json }} the expanded text will be parsed as YAML and the following will be logged instead of the expected JSON.

example.log:

OrderedDict([('a', 'a value'),('b', 'b value'),('c', 'c value')])

Buggy code producing this result looks like:

{% set logline_data = {
    'a': variable_a,
    'b': variable_b,
    'c': variable_c
  }
%}

structured-logging-attempt:
  file.append:
    - name: /var/log/example.log
    - text: {{ logline_data|json }}