I have a custom voice element that replaces the audio items in a MFoundationForm based on an API. It's been working but now we need to allow SSML. How do I construction VoiceElementConfig.SayItSmart audio items or VoiceElementConfig.AudioItem audio items with SSML. It looks like I can do VoiceElementConfig.AudioItem but for some reason the 2nd audio item in the group does not play in Google TTS.