@Ming Welcome to Microsoft Q&A, Thank you for posting your here!!
As of now there is no option to provision auto-expandable disks in Azure. However, we have larger and more powerful Azure Managed Disk sizes of up to 32 TiB on Premium SSD, Standard SSD, and Standard HDD disk offerings. In addition, we support disk sizes up to 64 TiB on Ultra Disks for more information please check the document
Pricing calculator for Managed disk :https://azure.microsoft.com/en-in/pricing/details/managed-disks/
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