Are navigation added automatically to the dbSet?

I have a question Dbset

public class Question {
public int Id {get; set;} 
public string Text {get; set;} 
public virtual ICollection<Choice> Choices {get; set;} = []

Choice DbSet/Model

public class Choice
{
    public int Id { get; set; }
    
    [Required]
    [MaxLength(100)]
    public string Text { get; set; } = string.Empty;
    
    [Required]
    public int QuestionId { get; set; }

    
    [JsonIgnore]
    public virtual Question Question { get; set; }
}

I am sending data from angular.

{
   text: "dfdfdfd",
   choices: [
      { text: "choice1"},
      { text: "choice2"}
   ]
}

Now if i add it to the dbset, in the following way,

_context.Questions.Add(Question);
        await _context.SaveChangesAsync();

It is adding only the questions to the Dbset Why are the choices being ignored?