[Flutter] How to access a hierarch dart class attribute?

How can I manage image paths for different categories, like logos and backgrounds, in Dart? I tried using nested classes like in Java, but Dart doesn't support that! What are the best practices or alternatives to handle this?


void main() {
print(Images.background.lake); // it dosn't work!
}

class Images {
class Portrait {
final traditional = 'assets/images/portrait/traditional.png';
final environmental = 'assets/images/portrait/environmental.png';
}

class Background {
final nature = 'assets/images/background/nature.png';
final lake = 'assets/images/background/lake.png';
}
}

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