You can craft a message for a line break for that specific styling. There’s no way to get it to work for all users because different people have chat set up differently. So while for a set of users it may look like a line break, to everyone else it looks like messed up copy-pasta that’ll get you banned from the channel. Or if it’s a channel bot attempting to do it, it’ll look like the broadcaster/mods were not capable of correctly setting up bot commands.