Here’s an image of an example:
If someone’s rank is a staff rank (mod,admin,owner) they can see the channel and type in it, also how to make “chatmakesystemmessage” in it
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Read through this dev wiki article: Customizing In-Experience Text Chat | Documentation - Roblox Creator Hub
There’s a section that talks all about creating and configuring channels. It also has some extra information about creating your own chat filter, and modifying the current one(Make sure to follow ToS), channel events, and command functions.