curl --request POST \
  --url https://qall.io/api/analytics/charts/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "queries": [
    {
      "column": "<string>",
      "operation": "<string>",
      "table": "<string>",
      "filters": [
        {
          "column": "<string>",
          "value": null,
          "values": [
            "<unknown>"
          ]
        }
      ],
      "id": "A"
    }
  ],
  "compare_previous_period": false,
  "date_range": "30d",
  "granularity": "day",
  "group_by": "<string>",
  "limit": 50,
  "sort": {
    "by": "value",
    "direction": "desc"
  }
}
'

import requests

url = "https://qall.io/api/analytics/charts/preview"

payload = {
    "queries": [
        {
            "column": "<string>",
            "operation": "<string>",
            "table": "<string>",
            "filters": [
                {
                    "column": "<string>",
                    "value": None,
                    "values": ["<unknown>"]
                }
            ],
            "id": "A"
        }
    ],
    "compare_previous_period": False,
    "date_range": "30d",
    "granularity": "day",
    "group_by": "<string>",
    "limit": 50,
    "sort": {
        "by": "value",
        "direction": "desc"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}