Sign API creating widget

Hi all,

I am creating a widget using the following:

{
   "widgetCreationInfo": {
   "fileInfos": [
  {
   "transientDocumentId": id['transientDocumentId']
  }
  ],
   "formFieldLayerTemplates": [
   {
   "libraryDocumentId": "3AAABLblqZhBmYEc...."
   }

  ],
   "name": 'NEW WIDGET'
   }
}

The formFieldLayerTemplates adds singable fields - when using this property via the /agreements endpoint there is a locations property and when using the online GUI to add a template there is also the option to specify a page number. I have tried all sorts and read all sorts but I can't find any property in the widgets endpoint that allows to specify a page number.