Mongodb $addToSet array with objects

I have the following document

{
  "_id": "A",
  "partsIds": [
    {
      "partId": "B",
      "someOtherField": "value"
    },
    {
      "partId": "C",
      "someOtherField": "value"
    }
  ]
}

Now, what I am trying to achieve is $addToSet to the partsIds array, using the partId field value.

So, what I do is

collection.update({ _id: 'A' }, { $addToSet: { partsIds: { partId: 'B' } } }, {upsert: true});

This operation adds a new object to partsIds array no matter what.

What I am trying to achieve from this is find if partId === 'B' exists don't add anything, if it doesn't, it adds it to partsIds array.

How can I achieve this using mongodb?

I found this answer Using Mongoose / MongoDB $addToSet functionality on array of objects

But it doesn't solve my problem, since it adds a new document when used with upsert.

The way I approached this to get the desired behavior is the following, but I am wondering if there is a way to fully do this on mongo side in one go.

let doc = collection.findOne({ _id: 'A', 'partsIds.partId': 'B' });
if (!doc) {
  collection.update({ _id: 'A' }, { $push: { partsIds: { partId: 'B' } } }, { upsert: true });
}