Why is the hook not applied in prestashop?

Question

Prestashop

I'm trying to create a button to add to my wishlist. I created a hook, registered it, but I can't do anything with it( What am I doing wrong?

mymodule.php

public function install()
    {
        Configuration::updateValue('FAVORITES_LIVE_MODE', false);

        return parent::install() &&
            $this->registerHook('header') &&
            $this->registerHook('backOfficeHeader');
            $this->registerHook('addToWishlist');
    }

    public function hookAddToWishlist()
    {
        return "Hello from ".$this->name;
    }

product.tpl

<strong>{hook h='addToWishlist' mod='favorites'}</strong>

I installed the module, I don’t understand why there is no my hook in transplant modules (