How can AEP leverage the capability of sharing established cross-account S3 buckets?

I was reading this capability as applied to Audience Manager (https://experienceleague.adobe.com/docs/audience-manager/user-guide/implementation-integration-guides/receiving-audience-data/batch-outbound-data-transfers/authorize-s3-cross-bucket.html?lang=en) and figured it should especially work for AEP.  There is just no documentation I can find to explain how to set that up.  Would it be something like Adobe support adds some shared account (Adobe AWS account configured for my client) by giving us that account name, populating it into the list of accounts in the S3 account list, and having the client put that account into its allow list in their AWS account?  It would seem if a client has spent the effort to work through InfoSec with Adobe Experience Cloud, those features should be usable in AEP, especially features for data access.