Admin can monitor All (joined and not) Personal Channel's Chat History

Admin can monitor All (joined and not) Personal Channel's Chat History

We discovered that few of our staffs do personal channel for their own purposes like selling, bashing their superior and etc. Since, it is provided by the company (we're using Zoho One Enterprise). The management dont want to tolerate this and want the admin level access to monitor all the messages in channel and PM/Chat history. Is there possible?