Accessing the Saved Models in the AfterImport Event

[ts-sebastian]

i'm trying to access the Saved Models in the AfterImport Event to send Notifications to the respective Mails in there.
I import the Model like follows:

public function model(array $row)
    {
        return new Customer([
            "name" => $row['name'],
            "mail" => $row['email'],
        ]);
    }

public function registerEvents(): array
    {
        return [
            AfterImport::class => function(AfterImport $event) {
                // SEND NOTIFICATIONS HERE
            },
        ];
    }

But the $event-> getConcernable();
Doesn't return anything except App\Imports\CustomImport {#1270} // app/Imports/CustomImport.php:40