I've created a CPT based on the Page and added some custom fields to it, besides using the title, excerpt and featured image. I've created a relationship from the Post type to this CPT. And now I want to show the values of this CPT at the bottom of the post. So I created an MB view. However, the insert field option shows the custom fields of the CPT, but not the default title, excerpt and featured image. How can I add those to the MB View?