Get data distributed by field value

Working with Data Drivers
1

i want to get orders distributed by field > fulfillmentStatus:null in next stage i want to get object like {unfulfilled: data, order:data}

exports.getAllOrdersReport = async (req, res) => {
  const { accountId } = req.account;
  const { startDate, endDate } = req.query;
  try {
    const stores = await Account.findById({ _id: accountId }).distinct(
      'stores'
    );
    //   .exec();

    let filter = {
      storeId: { $in: stores },
      dispatchStatus: { $ne: 'cancel' },
      //   deliveryStatus: { $ne: 'not_delivered' },
      //   isAssigned: true,

      //   isoCreatedAtDate: {
      //     $gte: new Date(startDate),
      //     $lt: new Date(endDate),
      //   },
    };

    const resultOrders = await Order.aggregate([{ $match: filter }]);
    res.status(200).json(resultOrders);
  } catch (error) {
    console.log(error);
    res.json(String(error));
  }
};