Task Relations via Quick Add Magic?

I was wondering if there was any way to set parent, sub, or other relations through the “Quick Add Magic”? If this isn’t already a feature it would be pretty awesome to be able to add subtasks to an existing task through the main menu. Also maybe coloring the text when it’s recognized as a quick add so tell that it is detecting it!

You can add parent-child relations when the sub tasks are indented, using multiline input. Like this:

parent
  subtask 1
  subtask 2
    sub substask 3