How to send formatted json data to labels and prettify it?

Grafana Configuration
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I’m a newbie in Grafana Loki plugin and I have one very interesting question.
Recently, I set up self-hosted grafana-server and Loki like systemctl services.
Writing own python library to send data from Django requests took time and I have the problem.
While sending dict object to Loki in my "stream" : {} object, I get error, so I use either json.dumps(dict) or f"{dict}" formats of my json headers and json_body:

first
first1850×580 60.4 KB

second
second1855×717 63.5 KB

My working configuration is:

data = {
            "streams": [
                {
                    "stream": {
                        "host": self.host,
                        "levelname": record.levelname,
                        "headers": f"{record.message['headers']}",
                        "json_body": f"{record.message['json_body']}"
                    },
                    "values": [
                        [
                            str(self.format_timestamp(record.created)),
                            record.message["method"]
                        ]
                    ]
                }
            ]
        }

How can I send properly json format dicts to labels to make them real json on the first screen and properly prettify them like I do on the second screen?