How to add a custom NPC?

Hello, 

I'm trying to add CustomScientistNPC from chaoscode.io's Plane Crash event but for the life of me I can't get Skill Tree to award xp for it. I added it in like this to the config

"ScientistHeavy": 300.0,
 "CustomScientistNPC": 300.0,

and I tried to add it to the .cs like this 
AwardXP(attacker, config.xp_settings.xp_sources.CustomScientistNPC, npc, false, false, npc.name ?? npc.ShortPrefabName);

But no luck. Would you be able to tell me how to add a custom NPC in?

Side note. When the scientist is killed, in the console it is called HeavyScientist. I did try to add that in just the same way and that also did not work.

Plugin doesnt support custom NPCs from chaos code at this point. It would need to be coded in.

Ah ok.