Trunas Scale virtual disk format

Having upgraded from Truenas Core to TrueNAS Scale, I’d like to take advantage of it’s virtualisation.

I have a VMware 6.5 virtual machine I’d like to run in TrueNas. It seems pretty straight forward to create the VM. The question I have is, what the disk format?
And how do you convert from VMwares .VMD format to TrueNas’ ?

Any suggestions/advice ?

Thanks