I can't make a correct query to get data through an intermediate table?

Question

Laravel

DB Structure

ORDERS:
id
status_id
.....


ORDER_ITEMS:
id
order_id
.....


SCHEDULE_SLOTS
id
order_item_id
......

How can I make the SCHEDULE_SLOTS model related to ORDERS through ORDER_ITEMS ?

// Отношение «один-к-одному» без проблем
public function getOrderItem() {
    return $this->hasOne('ModelOrderItem', 'id', 'order_item_id');
}

// А вот тут начинаются трудности
public function getOrder() {
    return $this->hasOneThrough('ModelOrder', 'ModelOrderItem',  ..... );
}

In fact, I can get the information itself if I specify the relation in ORDER_ITEMS :

public function getOrderItem() {
    return $this->hasOne('ModelOrderItem', 'id', 'order_item_id')->with(['getOrder']);
}

But my final task is to make a selection of SCHEDULE_SLOTS , specifying the conditions for the fields in ORDERS . Those. Roughly speaking, I have such a selection code, but there are no getOrder relations themselves.

$returnData = ModelScheduleSlots::with(['getOrderItem', 'getOrder'])
            ->whereHas('getOrder', function ($q) {
                $q->where('status_id', 1);
            });

Well, or until it's too late, the DB structure can be corrected. The main thing is to understand what.