[
    {
        "$match": {
            "challengeId": ObjectId("6674404413958543b594fe6f")
        }
    },
    {
        "$project": {
            "email": "$registrationDetails.email",
            "points": "$overAllImpact.point",
            "WeightImpact": "$overAllImpact.overAllWeightImpact",
            "eventPoints": "$eventPoint",
            "weeklyWeightLog": {
                "$objectToArray": "$weeklyWeightLog"
            }
        }
    },
    {
        "$unwind": "$weeklyWeightLog"
    },
    {
        "$addFields": {
            "weeklyWeightLog.kDate": {
                "$toDate": "$weeklyWeightLog.k"
            }
        }
    },
    {
        "$sort": {
            "weeklyWeightLog.kDate": -1
        }
    }
]