You are looking for a report that shows Disk Space Utilization vs provisioned is that correct?
You can enable VM insights for your virtual machines then view this in Azure Monitor or create a custom KQL query like this one to do this.
Once you have VM insights enabled you can view the data for Logical Disk Space Used %. See Multi-VM perspective from Azure Monitor for a guide on how you can view this data.
Hope this helps! Let me know if this works for you or if you need more information.
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