Is it posible to disable Grenades for Zombies in .json?

anyone knows how i can disable grenade for zombies?
is ther a option for?

I'll add one in for you now.

thxalot.
u know why i get after every kill from a Scarecrow this message in the server log?

<color=#aff>[grenade.beancan.entity[520278]] SwitchParent Missed frankensteinpet_corpse[520414]</color>
<color=#aff>[salvaged_cleaver.entity[520276]] SwitchParent Missed frankensteinpet_corpse[520414]</color>