Mix serialization of FHIR and regular objects?

[ghost]

Hi,
I have a situation (consider it an ASP.NET Core MVC API controller return) where FHIR and non-FHIR information need to be returned in the same result. For example, think of a user account that's in your own database + that user's Person record from FHIR.

If I make that two separate calls, each returning the pure (UserAccount or Person), it works perfectly. But if I try to create an encapsulation object that -- say -- has these two as member properties and try to send that, I get only the native UserAccount and not the Person (it comes through as default).

Example object to send:

public class Example
{
    [JsonPropertyName("userAccount")]
    public UserAccount UserAccount { get; set; }

    [JsonPropertyName("person")]
    public Hl7.Fhir.Model.Person Person { get; set; } = new();
}