missing custom casting

idk if this can be classified as an issue but i have problem casting string to a custom class in automaping
i see no option in automap example to cast string field to customclass
example below
db.select(TEST.class)
.get()
.subscribe(
E -> System.out.println(E.getA())
).dispose();

deffinition of TEST interface :
@Query("select '{\"X\":1, \"Y\":2}'::json \"A\";")

public interface TEST {

@Column("A")
CUSTOMTYPE getA();
}
deffinition of CUSTOMTYPE interface :
public interface CUSTOMTYPE {

@Column("X")
int getX();

@Column("Y")
int getY();

}