How to add frappe.whitelist function in hooks.py

I want to add new
@frappe.whitelist(allow_guest=True)
def get_item_attribute(doc):
print(‘startttttttttttttt’)

In sales invoice Item

May I know how to add in hooks.py

I Used this below code but its not working.

override_whitelisted_methods = {
“Sales Invoice”: “vvpaiint_erp.vvpaiint.custom.get_item_attribute”,
}

Can anyone please help me.

Thanks,
S.Kavitha.