[{"TRAFFIC-POLICE":[{"tpIdNum":"KB001","tpName":"Kevin Brown","makeReport":[{"reportId":"TO-001","reportDate":"7-October-2021","hasViolation":[{"violationId":"VID-001"}]},{"reportId":"TO-002","reportDate":"12-November-2021","hasViolation":[{"violationId":"VID-002"}]}]},{"tpIdNum":"TM001","tpName":"Thomas Moore","makeReport":[{"reportId":"TO-003","reportDate":"7-October-2021","hasViolation":[{"violationId":"VID-002"}]}]}],}]

db.collection.aggregate([{$unwind:"$TRAFFIC-POLICE"},{$group:{_id:"$TRAFFIC-POLICE.tpIdNum","Total":{$addToSet:{"Name":"$TRAFFIC-POLICE.tpName","ID":"$TRAFFIC-POLICE.tpIdNum",}},"Total Reports":{$first:{$size:"$TRAFFIC-POLICE.makeReport"}}}},{$unset:"_id"}])