PEX Groups :

Admin:
    prefix: '&4[ADMIN] '
    permissions:
    - '*'
    rank: '7'

me :
ca026eec-c8c1-386b-9f1e-61cbe9ccf01b:
    group:
    - Admin
    options:
      name: ThisIsMac

I got all groups that i need with /pex group list so doesnt come from configuration.