Groupmanager User files

Hey, I have a groupmanager user file with over 24.000 lines and i have to convert it to online UUIDs OR Usernames. The user file is using Fake UUIDs (From Essentials).

Example:

Code (Text):

  187cc319-f870-33f3-abd0-585aa0d0655c:
    lastname: pilenphillip
    group: C
    subgroups: []
    permissions: []

TO (Name):

Code (Text):

  pilenphillip:
    group: C
    subgroups: []
    permissions: []

OR (UUID):

Code (Text):

  7a8af8c9-e850-4a98-a713-0ebf3f18e320:
    lastname: pilenphillip
    group: C
    subgroups: []
    permissions: []

Please contact me if you are willing to do it, or know how to do it.