Include my own example pictures in filepicker (Intent.ACTION_PICK)

Question

I'm letting my users pick an image from their file system with Intent.ACTION_PICK. But some users are lazy and don't want to use their own images so I'd like to include a few default/example images that come preinstalled with the app.

Basically I want that the file picker opens a folder of my own app first (from where the user could also navigate to his own files if he wants). The images that come preinstalled with the app should not be accessible by other apps. Only if the file picker is started from my app. So i don't want to just copy them onto the file system.

Is there simple a way to do this? I thought about ContentProviders and DocumentProviders but I'm not sure if that's what I'm looking for.

Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, 1);

...

@Override
public void onActivityResult(int requestCode, int resultCode, Intent resultData) {
        Uri uri = resultData.getData();