You can add a set of POIs (points of interests) and/or a set of your own hotels in case you have a group deal, sponsorship deal, or whatnot.
Insert the JSON into the poi
or hotels
parameter. You have to make sure the JSON is valid, then minify the JSON, and finally URL encode it before pasting it into the query param. Take note of the max characters in a URL bug, since encoded JSON tends be long..