Allow folders for wallpapers in iOS and iPadOS

You aren't writing anyone from Apple here. This is a user to user only forum, which Apple neither participates, nor reads for user feedback.

I don't know what you mean by allow folders for Wallpapers? In my Photos App, I have a folder of photos I've stored exclusively for Wallpapers. You have the ability to create folders on your iPhone in Photos and name them anything you want. You could create as many folders of photos you want for Wallpapers and you could name each folder individually. For example you could have a Folder of Wallpapers for Nature. Wallpapers which are Blue, Red, Green. Virtually anything you want.

See if this helps you --> Create and work with photo albums on iPhone - Apple Support

Am I missing your point? Perhaps you could provide more information about what you're hoping to do.

"Allow folders for wallpapers in iOS and iPadOS: suggestion: allow folders for wallpapers in iOS, iPadOS"

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Allowing Folders for Wallpapers:

Are looking to add is folders of your own on the home screen, as if it were a computer's Desktop? If so, know that digging through your system files is not a feature of iOS, as of this reply. If you would like it to be an option, then make a recommendation to Apple. As long as you have Files turn on in iCloud, and it is not made inaccessible by ScreenTime, then you'll see that app's Folder-appearing icon, for certain.

Recommend this to Apple:

Do your Part: These are user-to-user forums. Apple rarely reads these forums on their own time as it is. So, provide Apple with feedback on this.  Apple wont get back to you directly, but the more they hear of this, the more they will know what is going on, and what to include in iOS versions to come. Being there is no direct feedback link for the iOS, use the iPhone feedback page.

To Provide Feedback:

1. Go Here: Feedback - iPhone - Apple
2. Select: "Feature Request" for the "Feedback Type"
3. Comment: on why you want this to be an option, and how it can help others. Include the URL of this thread.
4. Proceed form there as necessary