docs: Add text_to_speech left out in the API response (#19862)

web/app/components/develop/template/template_chat.ja.mdx

@@ -1192,6 +1192,13 @@ import { Row, Col, Properties, Property, Heading, SubProperty, Paragraph } from
       - `enabled` (bool) 有効かどうか
     - `speech_to_text` (object) 音声からテキストへ
       - `enabled` (bool) 有効かどうか
+    - `text_to_speech` (object) テキストから音声へ
+      - `enabled` (bool) 有効かどうか
+      - `voice` (string) 音声タイプ
+      - `language` (string) 言語
+      - `autoPlay` (string) 自動再生
+        - `enabled`  有効
+        - `disabled` 無効
     - `retriever_resource` (object) 引用と帰属
       - `enabled` (bool) 有効かどうか
     - `annotation_reply` (object) 注釈返信
@@ -1247,6 +1254,12 @@ import { Row, Col, Properties, Property, Heading, SubProperty, Paragraph } from
       "speech_to_text": {
           "enabled": true
       },
+      "text_to_speech": {
+          "enabled": true,
+          "voice": "sambert-zhinan-v1",
+          "language": "zh-Hans",
+          "autoPlay": "disabled"
+      },
       "retriever_resource": {
           "enabled": true
       },