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As mentioned, without Chat Room support in 11.x/12.x, there is not migration "to". Setting this as no plans to implement... however, when Chat Rooms are delivered a migration tool from v9 environments will be considered. Thank you for this feedback.
There are no Chat Rooms in Sametime 11.x/12.x, so there's no "destination" where you could migrate the data from Sametime 9 Advanced Chat Rooms to.
Sametime 11.x/12.x only has group chats, that work quite differently from Chat Rooms in Sametime 9.