Mongodb 3.6 and BIRT $unwind Aggregate

Migrateduser

I have an array of camperIds that I would like to $unwind so I can join them to another table i.e.

    {
        "_id": "KCnSWrdTurKA9u9",
        "startDate": "2017-09-09",
        "endDate": "2017-09-30",
        "capacity": 30,
        "price": 80,
        "seatsAvail": 28,
        "theme": "FC",
        "camperIds": ["MiNXJS3mW873a5ASA", "e7sj7smAoEw6jDc7v"],
        "extendedCareList": [{
            "camper": "MiNXJS3mW873a5ASA",
            "beforeCare": false,
            "afterCare": false
        }, {
            "camper": "e7sj7smAoEw6jDc7v",
            "beforeCare": false,
            "afterCare": false
        }]
    }

In a mongo shell I can run the following command to retrieve the data:

db.camps.aggregate([{
$unwind: "$camperIds"
},
{
$lookup: {
from: "campers",
localField: "camperIds",
foreignField: "_id",
as: "camper_List"
}
}
])

I'm not sure how to accomplish this in BIRT or whether it's even possible.
Any insights, tutorials, examples, tips would be appreciated.