Hi @Rishi_uttam,
Welcome to MongoDB community!
What you probably looking for can be achieved with separating the insert logic to $setOnInsert operator:
https://docs.mongodb.com/manual/reference/operator/update/setOnInsert/
This allows you to do $push or $addToSet clause for updates and a different logic for $setOnInsert.
Example:
db().collection(‘Users’).updateOne({ email: data.email },
{ $push: { item : arrayItem },
$setOnInsert : { insertData} },
{ upsert: true })
Thanks
Pavel