Custom URLs for Website Builder subpages

It would be very useful to be able to customize the URLs of subpages created in the Website Builder.

Right now, subpages are generated with auto-created URLs containing random IDs, for example:
https://example.com/page/pg-1766344473058-77823

Instead, it would be much better to allow readable, SEO-friendly slugs, such as:
https://example.com/page/guide

This would improve branding, user experience, SEO, and make links easier to share and remember.