Generate Upsert Resolvers

I was wondering if I can modify the updateOne or createOne generated resolvers to insert/update depending on whether the document exists.

Usually, I would just create a custom resolver and pass the `{ upsert: true }` option to mongoose. But it would be a lot of work to make a ton of custom resolvers for something that can easily be generated but with a small change.

Please let me know if there is any way to accomplish this! Thanks!