my guess is that is just a snippet of a larger piece of code, these being the basic descriptors of the "room" as you can't really get two lines of code in a chat room to use the code in an existing room. but that does not mean i am not going to try, will tell you what happens.
another idea is to do a search on google or something on how to make a room on rocket.chat? might help, that is how i learn most things.
RE: Create a Group Chat Room In Rocket.Chat?