How to make repeated attempts with progressive delay?

I want to make each retry attempt each time more delayed. However, I could not do it, because there is no delay property in ErrorEvent:

Yii::$app->queue->on(Queue::EVENT_AFTER_ERROR, function (ErrorEvent $event) {
    if ($event->job instanceof SomeJob) {
        //$event->delay = $event->attempt * 30; // there I want to set delay based on attempt
        $event->retry = $event->attempt < 5;
    }
});

It would also be nice to add in the RetryableJob method getRetryDelay:

public function getRetryDelay($attempt, $error)
{
    return $attempt * 30;
}

Start by tracing ErrorEvent handling and the RetryableJob retry flow to see where retry timing is selected and how queue backends apply it. Define how a getRetryDelay($attempt, $error) hook or event delay should interact with the existing retry flag, then verify that repeated attempts can use increasing delays without changing current retry behavior.