Return list in an array - Webapi C#

Question

Good guys. I need to return a list of courses linked to a particular student, this list will be consumed through the get of a Webapi.

I have the classes "student", "course" and "cursoAluno" (tables in the base - Entityframework).

the student table does not have the course id, the course table does not have the student id, hence I created the course Student, in it I have the Id(Identity), idAluno, idCurso.

I need that when consuming webApi is returned the following structure:

{
"id": 2,
"nome": "João Silva",
"endereco": "RUA que sobe e desce",
"mensalidade": 0,
"cursos": [
    {
        "id": 2,
        "nome": "Portugês"
    },
    {
        "id": 5,
        "nome": "Matemática",
    }
]
},

I changed the class to :

public class Aluno {
public int Id { get; set; }
public string Nome  { get; set; }
public string Endereco  { get; set; }
public double Mensalidade  { get; set; }
public List<Curso> Cursos { get; set; }
}

and at the time of popular the list I did so:

var aluno = dbContext.Alunos
    .Include("Cursos")//Irá carregar os cursos vinculados aos alunos
    .Find(id);//Obtém apenas um aluno

But it’s not returned the way I need it. Can someone help me with this ? I am using Webapi C#

Grateful.