Create File Browser with Ionic - Android ISSUE

I would like to ask you all a question. I have to create a file browser with Ionic Framework and I successful created following Nic post: - ionic-file-browser-app

I’ve also added these lines to config.xml:

<preference name="AndroidPersistentFileLocation" value="Internal"/>
<preference name="AndroidPersistentFileLocation" value="Compatibility"/> 

All work well, but I would like that android behaves like iOS, in fact iOS root directory is the app’s document root, instead the Android root directory is

The question is. How can I set my personal root directory for Android? Like this, for example: