LuckPerms allows you to set the display name of a group and it allows for spaces and special characters.
In the example image, I have two groups, one named MobMultiplier50p and another Mob Multiplier 100%.

In the image below I tried to set the group name in the MFM config and I think that is how it should work. Obviously, if I leave out the quotes, I can't put spaces because then it would assume it's the percentage instead of a group name.
