[How to register CV]
Edit the CV.json as follows.

"5" : {"cv": 4},  //All wood plank is 4 CV
"351" : {"cv": 1},
"351_4" : {"cv": 256},  //Lapis lazuli is 256 CV, otherwise 1 CV
"ItemID.ingotBronze" : {"cv": 1024},  //Bronze ingot is 1024CV

"257": {"cv": 3076, "type": "pickaxe"}, //Iron Pickaxe is "pickaxe" (set Enchant Type)

EnchantType key is the follows.
helmet
chestplate
leggings
boots
sword
shovel
pickaxe
axe
hoe
bow
fishing
shears
carrot