No, that's not possible. That storage is only available for the OneDrive for Business sites for the user assigned the license, regardless of whether it is use or not.
One Drive Cloud Storage with E3 Subscription
Ramu Vankala
50
Reputation points
Hi Team,
Greetings!!!
I have a question. Right now, my organization has 100 E3 subscriptions. Each account can be allocated up to 5 TB of storage, but not all users are using the full 5 TB. Is it possible to allocate 1 TB of OneDrive cloud storage to each user, and utilize the remaining storage elsewhere?