[{track:"Newcastle",time:"17:30",date:"22/04/2022",bookmakers:[{bookmaker:"Coral",runners:[{runner:"John",running:true,odds:3.2}]}]}]

db.collection.aggregate([{"$addFields":{"bookmakers":{"$filter":{"input":"$bookmakers","as":"b","cond":{"$in":["$$b.bookmaker",["Coral","Bet365"]]}}}}},{$project:{"_id":0,"__v":0,"lastUpdate":0}}])