<PackageReference Include="Newtonsoft.Json" Version="13.0.4" />

Newtonsoft.Json.DefaultValueHandling

public enum DefaultValueHandling
Specifies default value handling options for the JsonSerializer.
namespace Newtonsoft.Json { public enum DefaultValueHandling { Include = 0, Ignore = 1, Populate = 2, IgnoreAndPopulate = 3 } }