I don’t have an answer for you, just a warning: This is par for the course when it comes to Rocketchat, every major version seems to come with another piece of nagware, another limit, another thing paywalled. I run a server for the non-profit I work for and they haven’t even replied to my mails about maybe offering more affordable licensing for non-profit/education. Rocketchat narrowly won out over Matrix when Covid started but it sure as hell wouldn’t now.