Create a method with a return type with a type parameter

Hi

I'm developing a plugin for idea to add some methods, based on class annotations, and I'm trying to create a static method that return a class with a type parameter, something like this,

public static <T> Test<T> narrowK(Object hkt) {
  return (Test<T>) hkt;
}

But I couldn't find the way to do it using the API:

PsiElementFactory factory = PsiElementFactory.getInstance(project);
LightMethodBuilder narrowK = new LightMethodBuilder(PsiManager.getInstance(project), "narrowK");
narrowK.setContainingClass(clazz);
LightTypeParameterBuilder typeParameter = new LightTypeParameterBuilder("T", narrowK, 0);
narrowK.addTypeParameter(typeParameter);
narrowK.addModifier(PsiModifier.PUBLIC);
narrowK.addModifier(PsiModifier.STATIC);
PsiClassType returnType = factory.createType(clazz);
narrowK.setMethodReturnType(returnType);
narrowK.addParameter("hkt", factory.createTypeByFQClassName(OBJECT));
return narrowK;

I've tried also to create the method using `factory.createMethodFromText()` but it didn't work.

Thanks!