#not duplicate value
db.getCollection('profilesservices').updateOne({_id: ObjectId("603ce3bf9323e811c86cb7c8")}, {
 $addToSet: {"jobPreferences.jobInterests": {$each: ["mobile developer", "backend developer"]} }    
})

# with duplicate value
db.getCollection('profilesservices').updateOne({_id: ObjectId("603ce3bf9323e811c86cb7c8")}, {
 $push: {"jobPreferences.jobInterests": {$each: ["mobile developer", "backend developer"]} }    
})