Resolved: Push new Object inside a document array

const userSchema = mongoose.Schema({
   
   firstName: {
        type: String,
      
    },

   notifications : [{
    description: String,
    status: {
        type: String,
        enum : ['read', 'unread'],
        default: 'unread'
    },
    dateAdded:{
        type: Date,
        default: Date.now
    }
    }],
})

{ 
  _id: ObjectId('123')
  firstName: 'John Doe'
  notifications:[
   {
     description: 'somedescription'
     status: 'unread'
 
   },
   {
     description: 'somedescription2'
     status: 'unread'
   }
   
  ]

}

  User.updateOne(
     { _id: userId },
     { $push: { notifications: {description: 'new notifications'}  } }
  )

  User.updateOne(
     { _id: userId },
     { $addToSet: { notifications: {description: 'new notifications'}  } }
  )

  User.updateOne(
         { _id: userId },
         { $addToSet: { notifications: {description: 'new notifications',
  'status': 'unread'}  } }
 )