Example using Jinja2 to populate a JSON payload template

example.json

{ "path": "/content/geometrixx/my-first-jinja-page",
  "properties": [
    { "name": "jcr:primaryType",
      "value": "cq:Page" }],
    
  "nodes": [
    { "path": "jcr:content",
      "properties": [
        { "name": "jcr:primaryType",
          "value": "cq:PageContent"},
        { "name": "sling:resourceType",
          "value": "geometrixx/components/widepage"},
        { "name": "jcr:title",
          "value": "{{ page.title }}" },
        { "name": "cq:template",
          "value": "/apps/geometrixx/templates/widepage"},
        { "name": "cq:tags",
          "type": "String[]",
          "value": {{ page.tags|jsonify }} },
        { "name": "jcr:description",
          "value": "{{ page.description }}" },
        { "name": "sling:vanityPath",
          "value": "/connector-examples/json/" }]}
  ]
}

runner.py

import json
from jinja2 import Environment, PackageLoader

env = Environment(loader=PackageLoader('app', 'templates'))
env.filters['jsonify'] = json.dumps

# Template file at ./app/templates/example.json
template = env.get_template('example.json')

page = {
  'title': 'Jinja Example Page',
	'tags': ['jinja', 'python', 'migration'],
	'description': 'This is an example page created using Jinja2 with a JSON template.'
}

print(template.render(page=page))

upgrade to python 3.x which wants parens on the print statements