Can I customize Json.NET serialization without annotating my classes?

I need to serialize some entity classes to JSON, using Json.NET. In order to customize the names of the properties, I use the [JsonProperty] attribute like this:

    [JsonProperty("lastName")]
    public string LastName { get; set; }

The problem is, I'd prefer not to have any JSON-related attributes in my entities... Is there a way to externalize the annotations somehow, so that they don't clutter my entities?

Using XmlSerializer, it can be done easily with the XmlAttributeOverrides class. Is there something similar for Json.NET ?