How to insert or update an a array in MongoDB with Node.Js?

I have a products collection where some products have this structure :

{
_id: anID
shops: 
[
  {
    _id : shopId,
    price: productsPrice
  },
  ...
]
}

I would like update the price of a given products and shop, but insert this shop with his price if it is not present in the array.

I'm a beginner with MongoDB.Working with Node.Js/express(mongoDB driver) but not using mongoose.

Thanks in advance

Copyright Notice：Content Author:「apinot」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/59846498/how-to-insert-or-update-an-a-array-in-mongodb-with-node-js