In case the properties on a page should be made available for further processing, this property allows to select the properties to provide by their names.
The format of the JSON file is simple: There is an object properties with each property as attribute (name/value pairs as strings).
The JSON file is Base64 encoded and stored as the value of an HTML attribute.
The main use case for the additional property information is to provide them with the HTML Export. To generate the properties only on rendering the HTML Export version of a page, use
projectdoc.render-properties-map.export-html
If it should only be rendered in the View version, use