To the best of my knowledge, the Messaging API doesn't support @ tags at all. Further there isn't a concept of 'everyone' or 'all' @ tags in LINE. I've been looking to do this for a long time also. Platforms like Discord do have the ability to @ tag 'here' and 'everyone' as well as individuals but LINE Messaging API does not currently. Would be a great feature!
Posted： 2 months ago