Adding extra value at Model.create with Mongoose

I have a large array that comes in from an API that I'd like to store straight into MongoDB.

Model.create(largeArray) ... // many documents created

The problem is, I have one additional key:value pair that I need to set for all documents in that array. It's a user id, and many documents are created for a given user once per API call. So for a given Model.create call, the user id is the same for every doc in the array.

Without mapping over the array, is there an efficient way of adding a field with a consistent value? Something like Model.create(myLargeArray, {userId: someUserId}) would be ideal, but I know this isn't the case with the Mongoose API.

function addDocsForUser(largeArray, someUserId) {

  // each element of largeArray needs to have `userId: someUserId` added to it

  return Model.create(largeArray)
}