Can not see it on the roadmap too. The next feature on the roadmap would be "Enhanced analytics for videos". The tasks you describe are currently manual tasks. But you have the possibility to monitor the audit log and generate some own methods. Monitoring could be done manually or via PowerShell or by audit log API. It would be easier with a Stream API, on the roadmap für Q2/2020. Let's see and hope something would come. Saw the Ignite video too mentioning retention. See the Video here from from minute 21: https://techcommunity.microsoft.com/t5/microsoft-stream-blog/microsoft-ignite-2019-catch-up-on-micro... under the caption "Microsoft Stream under the hood: Architecture, administration, and compliance".
