Assign a single Help Center article to multiple brands directly

In a multi-brand workspace, allow a single Help Center article to be tagged or assigned directly to more than one brand's Help Center, instead of the article living under one brand only and access being controlled indirectly through user segments. Today, each brand has its own separate Help Center, and an article can only be attached to one of them. To make an article show up under a second brand, you have to either duplicate the article into that brand's Help Center or grant access via a user segment, there's no direct "this article also belongs to Brand B" option. Requested by a prospect running a white label, multi-brand support setup on behalf of their own customers, where some articles are shared across brands and some are brand specific.