Issue:
Basically when I join a server, all of the chat messages are restored including chats from single player or other multiplayer servers. Most of the times we do not need those. And many times it gets difficult to find server specific chat history.

Proposed solution:
Create a configurable toggle that'll help up restore chat history either globally or world specific. Also world specific chat history reload should reduce chat load time too.

Note: As far as I have explored, I did not find this feature in the mod. So if it is already present and I missed it, I apologize in advance.

it sounds to me like you're interested in using the vanilla chat clearing option, which clears the chat when leaving a world/server

No, what I meant is having world specific chat history. Lets say I join world A, do some chat and leave. Then join world B, do some chat and leave. When I join back to world A, it should restore chats from world A only and not B. And when I join world B, it should restore chats from world B only and not A.

oh okay interesting. so why is this preferred over the current system + searching?

I would say we rarely need chat history from one server in another. Mostly we like to see what was last discussion on the specific server only. Yes we can search, but that's not the same as getting the chat history of that server easily viewable. Its just easy to navigate through instead of searching through all chat history especially if I joined multiple servers since I joined the current server last.
I'm not saying make it default. But can make it a switch where in global mode it'll store all chats in a single file and restore from that. And in world specific mode it'll store all chats by server name/ip and restore from that.