Heritage with modelMapper

Question

I am creating a project in college, in which I need to register a user. In my controller I receive a User and need to convert to a type of user, being them student, teacher, coordinator or external user. I am using modelMapper to try to make this conversion but am having some problems.

Here’s an example of what I have

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type")
@JsonSubTypes({ 
        @Type(value = Aluno.class, name = "aluno"), 
        @Type(value = Professor.class, name = "professor"),
        @Type(value = UsuarioExterno.class, name = "usuarioExterno"),
        @Type(value = Coordenador.class, name = "coordenador") 
})
@Entity
public abstract class Usuario {
     private Long id;
     private String nome;
     private String email;
     ...

public class Aluno extends Usuario {
     private String ra;
}

public class Professor extends Usuario {
     private String ra;
}

public class Coordenador extends Usuario {
     private String ra;
}

and this here is my User

public class UsuarioDto {
     private Long id;
     private String nome;
     private String email;
}

Request

{
     "type": "aluno",
     "nome": "bruno",
     "email": "[email protected]",
     "ra": "0012345"
}

In the request I need to enter the type of the user("type"). I took a look at the documentation of the modelMapper but I could not understand their example with inheritance.