My idea is a chat that is based on being perceived only within a certain range. With the help of different commands, for example, you can scream so that the message can be seen in a larger radius, or whisper, which has the opposite effect.
That would add more reality to the game, because it's the same in real life.
All of this would require a plugin that can be downloaded through the following link:
(I don't guarantee that it will work because I haven't tried it myself yet, I just recommend it because of the good reviews)
I think the idea is good because chatting with other people feels better through more realism, especially when there are many people near/on the server.