Sot trying to be rude but CustomLoot Is not a plugin created by me i just use there api to give people more options on creating loot so it would be a question really for CustomLoot if your having a hard time creating a profile using that plugin. i recently implement "Crate Loot Table File Name And Total Item Slots To Use": {
"Default": 5
This will have a datafile you can edit edit and change the min/max and chance of the items that you want the npc to have a chance to drop
"Item ShortName": "fogmachine",
"Is Blueprint": false,
"Chance": 80.0,
"Min amount": 1,
"Max Amount": 1,
"SkinID": 0,
"Display Name": "Fogger-3000"