Knockback customisation (path)

Here is the situation , im making a custom spigot and im trying to add this to it : https://gist.github.com/prplz/88058283059dd46c8208c8a918c65bb8(wich is a way to customise knockback)

I know how to do it all except for the config.
Since the .java is the config , some people are telling me to implement it in SpigotConfig.java .
( Spigot-Server\src\main\java\org\spigotmc\SpigotConfig.java )
( https://github.com/Insided0/spigotconfig.java/blob/master/this )

But here is the problem : im not familliar with this so i dont know how it work.


Question: how do I implement it ? :unsure:

My first guess was to put it at the end of the code like that:

Code:

[...]
       }
   }
}

knockbackFriction = 2.0D;
knockbackHorizontal = 0.35D;
knockbackVertical = 0.35D;
knockbackVerticalLimit = 0.4D;
knockbackExtraHorizontal = 0.425D;
knockbackExtraVertical = 0.085D;

But im obviously wrong.

Any help is accepted.

 

@Insided_
Maybe this is best posted in the Spigot forum.