Actually I am not very sure that can be called "chat command", so if you have better ideas write them in the comments.
So in this game there are phrases,swears,advices... that you write very often and some of them have well known acronyms that you know: ss, gg, %%%, afk... , but some don't, so here is the idea the idea:
Instead writing novels every game, you will write it once in settings and use it's acronym or your own code and then the "novel" will be copied to the chat.
When you go in settings/chat at the bottom you will see "custom chat commands". Below you will see: