SupportedFeatures(SupportedFeatures)

{
    "adjust_mora_pitch": true,
    "adjust_phoneme_length": true,
    "adjust_speed_scale": true,
    "adjust_pitch_scale": true,
    "adjust_intonation_scale": true,
    "adjust_volume_scale": true,
    "adjust_pause_length": true,
    "interrogative_upspeak": true,
    "synthesis_morphing": true,
    "sing": true,
    "manage_library": true,
    "return_resource_url": true,
    "apply_katakana_english": true
}