Expo push notification use custom key

Please provide the following:

  1. SDK Version:42
  2. Platforms(Android/iOS/web/all):android/ios

Using the expo api for sending push notification how can I set another key and value, instead of the only ones that are defined in the docs right now?

contentAvailable : 1

along side other keys eg: (data, badge,…) would make it a silent notification for example.