It’s impossible for third party applications to modify the chat of users in anyway without potentially severely disrupting the game developers own configurations.
Callbacks such as TextChatService.OnIncomingMessage and TextChatService.OnBubbleAdded limit developers; only one source can update the appearance of bubbles, chat, etc. What if a developer has their own VIP bubble chat system, but wants to use HD Admin? Sure we could create our own API but this is not scalable for additional applications.
More details about these alternative methods here: