wkHTMLtoPDF's metadata

Metadata of wkHTMLtoPDF

{
  "driver": "wkhtmltopdf",
  "page-size": "A4", // A4|A3|... default if undefined
  "margin-top": "0mm", // default if undefined
  "margin-bottom": "0mm", // default if undefined
  "margin-left": "0mm", // default if undefined
  "margin-right": "0mm", // default if undefined
  "orientation": "Portrait|Landscape" // default Portrait if undefined
}