[{"at":ISODate("2022-11-19T10:00:00Z"),"areaId":3,"data":[{"label":1,"name":"a","sec":34,"x":10.3,"y":23.3},{"label":1,"name":"a","sec":36,"x":10.3,"y":23.3},{"label":1,"name":"c","sec":37,"x":10.3,"y":23.3}]},{"at":ISODate("2022-11-19T10:01:00Z"),"areaId":3,"data":[{"name":"a","label":1,"sec":10,"x":10.3,"y":23.3},{"label":2,"name":"b","sec":12,"x":10.3,"y":23.3}]}]

db.collection.aggregate([{$set:{data:{$filter:{input:"$data",cond:{$eq:["$$this.label",1]}}}}}])