[{"from":"Jeddah","delivery_rules":[{"to":"Makkah","expected_delivery_time":3},{"to":"Riyadh","expected_delivery_time":2}]},{"from":"Riyadh","delivery_rules":[{"to":"Makkah","expected_delivery_time":3},{"to":"Riyadh","expected_delivery_time":1}]}]

db.collection.aggregate([{"$match":{"from":"Jeddah","delivery_rules.to":"Riyadh"}},{$project:{expected_delivery_time:{"$getField":{"field":"expected_delivery_time","input":{$first:{$filter:{input:"$delivery_rules",cond:{$eq:["$$this.to","Makkah"]}}}}}}}}])