speaker: Represents the name of the voice.gender: Indicates the gender of the voice.age: Describes the age group of the voice.country: The country that the voice is associated with, typically representing the accent or regional dialect.dialect: More specific than country, this field can indicate a particular area within a country.demographic: Describes the demographic group the voice represents.genre: An array of genres that the voice is suitable for, such as ‘Conversational’.language: The spoken language that the model is usable for.lang: This is the value you pass to specify the language the selected speaker should speakmodelId: The model id that the speaker is available under