curl --request GET \
  --url https://api.hubapi.com/forms/v2/fields/{form_guid}/{field_name}

{
  "name": "<string>",
  "label": "<string>",
  "type": "<string>",
  "fieldType": "<string>",
  "description": "<string>",
  "groupName": "<string>",
  "displayOrder": 123,
  "required": true,
  "selectedOptions": [
    "<string>"
  ],
  "options": [
    {}
  ],
  "validation": {
    "name": "<string>",
    "message": "<string>",
    "data": "<string>",
    "useDefaultBlockList": true,
    "blockedEmailAddresses": [
      "<string>"
    ]
  },
  "enabled": true,
  "hidden": true,
  "defaultValue": "<string>",
  "isSmartField": true,
  "unselectedLabel": "<string>",
  "placeholder": "<string>",
  "dependentFieldFilters": [
    {}
  ],
  "labelHidden": true,
  "propertyObjectType": "<string>",
  "metaData": [
    {}
  ],
  "objectTypeId": "<string>"
}