How to get chat tags in chat?

請問一下，現在所提供的API中

1. Line官方帳號中，在聊天時，為用戶進行標記的那些Chat Tag可以被取出來嗎？ 該怎麼做？

2. 可以取得被標記為某個Chat Tag的所有用戶嗎？ 該怎麼做？ 謝謝

3. Is it available to get all chat tags which created in chat of Line Official Account? How to do It?

4. Is it available to get the follow users which marked with a chat tag? How to do it? Thank you.