[{"name":"Report1","specifications":[{"parameters":[{"name":"feature","value":["13"]},{"name":"security","value":["XXXX-695"]},{"name":"imageURL","value":["football.jpg"],}]}]},{"name":"Report2","specifications":[{"parameters":[{"name":"feature","value":["67"]},{"name":"imageURL","value":["basketball.jpg"],},{"name":"security","value":["XXXX-123"]}]}]}]

db.collection.aggregate([{$project:{_id:0,name:1,imageparam:{$let:{vars:{param:{$arrayElemAt:[{$filter:{input:{$arrayElemAt:["$specifications.parameters",0]},cond:{$eq:["$$this.name","imageURL"]}}},0]}},in:{$arrayElemAt:["$$param.value",0]}}}}}])