Optional bitrateThe maximum recommended bitrate in kbit/s. Ads with a bitrate below the specified maximum will be picked.
 - When set to -1, it will select the ad with the highest bitrate.
 - If there is no ad below the specified maximum, the ad closest to the bitrate will be picked.
-1
Optional languageThe language code of the UI elements. See localization docs for more information.
 - This will default to UIConfiguration.language when not specified.
Optional uiThe UI elements passed to Google IMA. See Google IMA docs for more information.
 - Available since v6.13.0.
Describes the configuration of Google IMA.