Amit Kumar As Microsoft is unlikely to commit to anything in this forum prior to the release and official announcements, perhaps I can provide some unofficial information that is a likely scenario to play out. This is all based on my own speculation and does not include any insider information that might be subject to NDAs.
Microsoft has been publicly making statements for at least a year at different conferences that this is something that they are working on. Given that it was mentioned again in a recent conference leads to speculation on my part that it is likely to come out soon.
I am guessing that the feature requires OS changes that are probably not present in released versions of the OS, and that we are likely to find that 2020H2 version of the OS will be a minimum requirement. Additional changes to the tooling to product packages are also a possibility, but given the App-V experience I'd hope that the packages don't need to know about each other in advance here, and that it would only be OS changes required. Still, assuming the OS support isn't already in 2004 and we are just waiting for some tooling, it will be some time before the majority of customers have deployed the required OS in production. Of course Microsoft could always back-port those OS changes, but that seems unlikely.