vRA 8.1 - Configuring disk multi-writer

I'm trying to automate setup of Oracle RAC in vRA 8.1 which requires the attachment of several shared disks.

When I place a volume in the blueprint and attach it to several VMs, the result in vSphere is the creation of several independent volumes, not one shared resource.

I'm wondering if it is possible to mark the disks as multi-writer from the blueprint?  Or is there another way to accomplish what I'm after?

Thanks