How to access a variable when an event occurs in opencart 2.2?

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I can't figure out how to access a variable in the opencart 2.2 event system. I will explain
in earlier versions of opencart I did this: I
created an event in my module:
$this->model_extension_event->addEvent('oproscupon_register', 'post.customer.add', 'module/oproscupon/after_register');
this event was generated automatically by the kernel when calling the
catalog\model\account\customer\addCustomer model (where addCustomer is a function)
defined the function in the controller of its module public function after_register($customer_id){
//code
}
the variable $customer_id is returned in the addCustomer function of the catalog model \model\account\customer
public function addCustomer($data) {
$this->event->trigger('pre.customer.add', $data);
//code
$this->event->trigger('post.customer.add', $customer_id);
return $customer_id;
}
it turned out that in my after_register event handler I had access to the $customer_id variable and could operate on it.
I can’t figure out how to access the same variable in opencart 2.2
in the catalog\model\account\customer model in the addCustomer function, the event generation function, to which the $customer_id variable would be passed, is not called.
how do I get access from my function (event handler) to the $customer_id model variable. do I need to explicitly call the $this->event->trigger function in the model? if so, then it turns out you need to change the kernel or use ocmod? or is there another way?
Help me to understand.