<PackageReference Include="Newtonsoft.Json" Version="13.0.2" />

Func<T1, T2, T3, TResult>

public sealed delegate Func<T1, T2, T3, TResult> : MulticastDelegate
namespace Newtonsoft.Json.Serialization { public delegate TResult Func<T1, T2, T3, TResult> (T1 arg1, T2 arg2, T3 arg3); }