curl --request GET \
  --url https://api.utage-system.com/v1/element-types/mail

{
  "data": [
    {
      "type": "<string>",
      "name": "<string>",
      "category": "<string>",
      "description": "<string>",
      "children_types": [
        "<string>"
      ]
    }
  ]
}