example.js

  const orderItemListPromises = orderItemList.map(orderItems =>
    Promise.all(
      orderItems.map(orderItem => {
        let filter = { where: { orderId: orderItem.order_id } };

        myStadistic.shopId = orderItem.shopId;
        listStatsToSave.push(myStadistic);

        return axios.get(
          url +
            "/" +
            orderItem.shopId +
            "/receipts?filter=" +
            JSON.stringify(filter),
          { headers }
        );
      })
    )
  );

  await Promise.all(orderItemListPromises);

  listStatsToSave.reduce((acc, current) => {
    // Aquí haces tus cosas
  });