toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (advancedVoiceOptions != null)
'advancedVoiceOptions': advancedVoiceOptions!,
if (audioConfig != null) 'audioConfig': audioConfig!,
if (input != null) 'input': input!,
if (voice != null) 'voice': voice!,
};