import requests

url = "https://{FUSION HOST}/api/collections/{collection}/schema/dynamicfields.schema"

response = requests.get(url)

print(response.json())

{
  "type": "String",
  "title": "<string>",
  "description": "<string>",
  "required": [
    "<string>"
  ],
  "properties": {},
  "additionalProperties": {},
  "minProperties": 123,
  "maxProperties": 123,
  "definitions": {},
  "category": "<string>",
  "categoryPriority": 123,
  "enum": [
    {}
  ],
  "hints": [
    "<string>"
  ],
  "unsafe": true,
  "default": {},
  "oneOf": [
    {
      "type": "String",
      "title": "<string>",
      "description": "<string>",
      "enum": [
        {}
      ],
      "default": {},
      "category": "<string>",
      "categoryPriority": 123,
      "hints": [
        "<string>"
      ],
      "unsafe": true,
      "oneOf": [
        {}
      ]
    }
  ],
  "propertyGroups": [
    {
      "label": "<string>",
      "properties": [
        "<string>"
      ]
    }
  ]
}