curl --request POST \
  --url https://api.example.com/accent_phrases

[
  {
    "moras": [
      {
        "text": "<string>",
        "vowel": "<string>",
        "vowel_length": 123,
        "pitch": 123,
        "consonant": "<string>",
        "consonant_length": 123
      }
    ],
    "accent": 123,
    "pause_mora": {
      "text": "<string>",
      "vowel": "<string>",
      "vowel_length": 123,
      "pitch": 123,
      "consonant": "<string>",
      "consonant_length": 123
    },
    "is_interrogative": false
  }
]