There are separate SDK's for ANT+ and ANT.
The ANT API's allows you to configure a channel how you would like, and read/write the raw data payload. You cannot use this for ANT+ devices though, as the ANT+ network is not available (as this would prevent other apps seeing the connected device).
Is your use case to connect to ANT+ devices? The "IRaw<Type>DataReceiver" callbacks provide the same information as the ANT message data payload bytes.