How add Hit chance tfs 1.2

[gohamvsgoku]

How to put hit chance in crossbow ? Where i need edit

 

[Shawak]

   <item id="7438" article="an" name="elvish bow">
       <attribute key="description" value="This beautifully ornamented bow was made by a skilled elvish bowmaker." />
       <attribute key="weight" value="3900" />
       <attribute key="slotType" value="two-handed" />
       <attribute key="weaponType" value="distance" />
       <attribute key="ammoType" value="arrow" />
       <attribute key="range" value="6" />
       <attribute key="hitChance" value="5" />
   </item>

Only works for ranged weapons afaik