@P, Pioline (Cognizant) Thanks for your patience! As mentioned earlier there is really nothing built into the service natively however, you can take advantage of both physical and software tagged "multi-tenancy" options depending on your requirements. Here is a quick overview of the options we have used.
You can also leave your feedback at Azure Feedback ForumProduct Group might consider it for future updates.
let me know incase of further queries, I would be happy to assist you.