@Calvin Shiells, Thanks for posting in Q&A. Based on my checking, the setting "QuotaSize" to set Shared iPad User Storage Quota is not available in either enrollment profile or shared iPad configuration profile.
https://learn.microsoft.com/en-us/mem/intune/enrollment/device-enrollment-shared-ipad
On what's new, I don't find this feature either.
https://learn.microsoft.com/en-us/mem/intune/fundamentals/whats-new
To request this, you can feedback in the following link which Intune Product will look into it when consider developing new feature.
https://feedbackportal.microsoft.com/feedback/forum/ef1d6d38-fd1b-ec11-b6e7-0022481f8472
Hope we can get this new feature in the future.
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