Can you provide an example using $lookup in Mongoose for following case: about ama HOT 3 CLOSED

Participant
    .aggregate([{
            $lookup: {
                from: "users",
                localField: "userId",
                foreignField: "_id",
                as: "userData"
            }
        },
        {
            $unwind: "$userData"
        }
    ]).sort({
        "userData.name": 1
    }).exec()