how to add new field with many data in that field in MongoCosmosDB - mongodb

Question

I would like to add new field into json already have in mongoDB Cosmos like this
{
"_id" : "6396cde306fd2d1088d584e4",
"userName" : "user-20526"
}
Now I would like to add a others field like this bellow userName field:
{
"_id" : "6396cde306fd2d1088d584e4",
"userName" : "user-20526",
"others": [
{
"address" : "city",
"phone" : "12345676543"
}
]
}
I user this function to do that thing, with updateDocument but it's not works for me:
const updateDocuments = async (value, condition, collectionName) => {
const DATABASE_COLLECTION_NAME = collectionName;
if (!db)
throw Error('findDocuments::missing required params');
const collection = await db.collection(DATABASE_COLLECTION_NAME);
const filter = { condition };
const filterJSON = JSON.parse("{" + filter.condition + "}");
const options = { upsert: true };
// get value (condition) and convert it to correct JSON format before call it in update variable
const getValue = { value }
const valueJSON = JSON.parse("{" + getValue.value + "}");
const updateDoc = {
$set: valueJSON
};
return await collection.updateOne(filterJSON, updateDoc, options);
}
The above function only works when we update one field that already have in data, the example I would like to update userName data, then that function is work, If I use that function to add new one then it's not, not add new one, how can I create more to add new field as what I expected before
anyone please help me