@Rahul We already have a uservoice for this particular scenario. You can use it to upvote and share your feedback as well. As a work around you can create a custom PowerShell script which will specifically look for disabled user accounts in local AD and then use that information to change the status on AAD.
You can use the information on this article to create a similar use case for disabled account. The article talks about expired password but we can use the idea for disabled accounts as well. If that does not help, any custom PowerShell script would do the job for you as unfortunately there is no direct built in way of doing it right now.
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