JSON Schema Property 'tts_engine'

"tts_engine": {
    "type": "object",
    "description": "Register itself as a speech engine.",
    "additionalProperties": false,
    "properties": {
        "voices": {
            "type": "array",
            "description": "Voices the extension can synthesize.",
            "minItems": 1,
            "uniqueItems": true,
            "items": {
                "type": "object",
                "additionalProperties": false,
                "properties": {
                    "voice_name": {
                        "type": "string",
                        "description": "Identifies the name of the voice and the engine used."
                    },
                    "lang": {
                        "type": "string",
                        "description": "Almost always, a voice can synthesize speech in just a single language. When an engine supports more than one language, it can easily register a separate voice for each language."
                    },
                    "gender": {
                        "type": "string",
                        "description": "If your voice corresponds to a male or female voice, you can use this parameter to help clients choose the most appropriate voice for their application."
                    },
                    "event_types": {
                        "type": "array",
                        "description": "Events sent to update the client on the progress of speech synthesis.",
                        "minItems": 1,
                        "uniqueItems": true,
                        "items": {
                            "type": "string",
                            "description": "",
                            "enum": [
                                "start",
                                "word",
                                "sentence",
                                "marker",
                                "end",
                                "error"
                            ]
                        }
                    }
                },
                "required": [
                    "voice_name",
                    "event_types"
                ]
            }
        }
    },
    "required": [
        "voices"
    ]
}

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