curl --request POST \
  --url https://api.bold-factory.com/v1/labels/templates/{templateId}/elements \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "type": "Shape",
  "x": 123,
  "y": 123,
  "width": 123,
  "height": 123
}
'

{
  "type": "Shape",
  "x": 123,
  "y": 123,
  "width": 123,
  "height": 123,
  "id": "<string>"
}