Implementing AddRuntimeMessage() on other classes

Typical error handling on the class where SolveInstance() is located is typically just a "AddRuntimeMessage(..)" at the catch() statement.

My question is -- how do I implement the AddRuntimeMessage() in an external class? Understandingly, I get this error whenever I try to implement AddRuntimeMessage() on any external classes.

For example, I am able to use AddRuntimeMessage() in a Custom Attributes class (GH_ComponentAttributes) by doing Owner.AddRuntimeMessage(). I am able to use the Owner property in this custom attributes.

I am interested in using the AddRuntimeMessage property without creating a custom attribute class, since this new class is simply there for organization sake.