Purview-Retention Policy for Private channels

I have retention policy for Standard & Shared channels together with 2 Years retention period to keep posts for 2 years and remove after that period. Don’t have any policy for Private channels posts/messages, so posts will be available indefinitely . With this https://www.microsoft.com/en-in/microsoft-365/roadmap?id=500380from Microsoft my private channels will also part of the same policy which is applied for standard & Shared channels . in this case how i can retain the posts from private channels indefinitely . Please suggest