ugly, but working solution

gistfile1.txt

{%- for key, value in salt['pillar.get']('rocketchat_settings').iteritems() %}

rocketchat_setting_{{key}}:
  module.run:
    - name: mongodb.update_one
{%- if value == True %}
    - objects: '{"_id": "{{key}}"} {"value": true}'
{%- elif value == False %}
    - objects: '{"_id": "{{key}}"} {"value": false}'
{%- else %}
    - objects: '{"_id": "{{key}}"} {"value": "{{value}}" }'
{%- endif %}
    - database: rocketchat
    - collection: rocketchat_settings
    - host: localhost
    - port: 27017
{%- endfor %}