UnityEvent with all derived types in listeners serialized in Inspector

Lets assume I have this code:

 [Serializable]
 public class UnityEventMessage: UnityEvent<EventMessage> { }
 
 [Serializable]
 public abstract class EventMessage {}
 
 public class Event1:EventMessage {}
 public class Event2:EventMessage {}

Now what I want is to set my UnityEvent in inspector like this:

 [SerializeField] private UnityEventMessage messageCallback = new UnityEventMessage();

After that, I want my event to accept all the derived classes in params to be set inside Inspector. But it accepts only base class - EventMessage

 public void TestCallback(EventMessage message) // This shows in inspector as Dynamic
 
 public void TestCallback(Event1 message) // cant select in inspector
 public void TestCallback(Event2 message) // cant select in inspector