I work with netapp all day.... The only chance with veeam is a instant recovery (which is a vol clone from the date you want to restore). At this point no space is consumed. The effect is kicking when you need to make a the move of the VM. Other way is full VM restore but it doesnt help....
If 100tb is the limitation maybe a Update to netapp ontap 9.12 will fix this because nearly all system has a incresed limit of 300tb volume. Anyway im not a friend of such big volumes, maybe you can split the datastores.
If you need only one or several parts of the VM for example only a vmdk you can do a single File clone within the netapp volume. It is a offline process, you need to specify the path manually on cli, but it doesnt consume extra space it online modifys the pointers within wafl.
Regards matze