This weakaura will display the group leader's current arena or rbg rating. Colored. Also the leader's faction, as at the moment cross faction queueing is disabled.
It provides a way to filter out the other faction and de-clutter LFG in rated pvp.
Thanks to Sumpfranze that provided inspiration with their neat code for LFG Raid Difficulty https://wago.io/aCV47c5-I