I wonder if there is any kind of prefix string for essentials.
e.g : [Rank]

Hi, have a look here
https://github.com/lucko/LuckPerms/wiki/Command-Usage:-Meta#lp-usergroup-usergroup-meta-addprefix

More info here as well: https://github.com/lucko/LuckPerms/wiki/Prefixes,-Suffixes-&-Meta

thanks