[{"_id":ObjectId("5f21a77c52efa009cc9857a7"),"results":[76,72,93]},{"_id":ObjectId("5f21a993b4d13477dd950904"),"results":[90,94,80]},{"_id":ObjectId("5f21a9a0b4d13477dd950905"),"results":[70,73,99]},{"_id":ObjectId("5f21a9abb4d13477dd950906"),"results":[91,85,99]}]

db.collection.aggregate([{$addFields:{tmp:{$filter:{input:"$results",as:"res",cond:{$gte:["$$res",90]}}}}},{$match:{"tmp.1":{$exists:true}}},{$project:{tmp:0}}])