curl --request GET \
  --url https://api.example.com/models/{model_name}/schema/{variantKey} \
  --header 'Authorization: Bearer <token>'

{
  "variant": {
    "key": "default",
    "url": "<string>"
  },
  "fields_in": [
    {
      "name": "<string>",
      "ftype": "<string>",
      "parent": "<string>",
      "description": "<string>",
      "allowed": [
        "<unknown>"
      ],
      "default": "<unknown>",
      "examples": [],
      "minimum": 123,
      "exclusiveMinimum": 123,
      "maximum": 123,
      "exclusiveMaximum": 123
    }
  ],
  "schema_in": {},
  "schema_out": {},
  "schema_stream": {}
}