My Dynmap chat hooks into all chats (local, global and staff) beyond discordsrv chat and i can't disable The local and staffchat, I am using nchat one fork of legendchat made to run on newer versions of Minecraft, it's possible to disable the local and staffchat on the Dynmap config.txt?

Greetings from Brazil

I marked it as a bug report because I'm not sure if it's a bug or not.

you can only disable all or no chat (wiki #FAQ 8), dynmap doesn't know about channels, it just hooks into the default mojang-created chat.