No NVDIMMs? With esxi 6.7, you can create fake PMEM devices.
This is unsupported and requires a host reboot. Sometimes more than one…
This will provide a PMEM pool for POC or skills development but the memory backing these devices is not persistent. For PMEM devices, just migrate the PMEM disks to standard Datastores when not in use. For NVDIMM devices, you will lose them if the host a VM is on loses power. There is no mechanism to state them to disk.
If there is important data, perhaps DD it to a file on the OS disk of the VM before shutting down.
The -v flag indicates the percentage of DRAM memory that should be allocated to virtual PMEM.