It’d be incredibly useful for organising content and assets to be able to stick assets next to their respective content pages, rather than in a site-global assets
directory.
Hugo’s documentation for this explains it a bit better than I can: https://gohugo.io/content-management/page-bundles/#readout
The interface for this could be very similar to existing, as this could just auto-populate the assets
attribute with the relative files. Although ideally without having to specify for each page whether it’s a bundle type or needs to explicitly define its assets.