db={"collection1":[{"taskId":"62925ec4e9ebd8e244287299","gebruikerId":"6287cd19af1540ea55212fee","fotoUrl":"<url>","afgerond":false,"notitie":"","_id":"62927baabc3b9a3603ad56aa","createdAt":"2022-05-28T19:44:42.559Z","updatedAt":"2022-05-28T19:44:42.559Z","__v":0}],"collection2":[{"_id":"62925ec4e9ebd8e244287299","taskNaam":"BodyShot","omschrijving":"Neem een bodyshot uit de navel van Nils","punten":100,"fotoUrl":"<url>","locked":true,"createdAt":"2022-05-28T17:41:24.358Z","updatedAt":"2022-05-28T17:41:24.358Z","__v":0}]}

db.collection1.aggregate([{"$lookup":{"from":"collection2","localField":"taskId","foreignField":"_id","as":"tasks"}}])