This of course, doesn't have to be NFS, but I use a NFS datastore that is R/O exported from a FileServer VM for just this purpose and it works great!
Note: You really type folder, just replace esxi.example.com!
Find OVA && right click >> copy link
Use Deploy Wizard and deploy from URL
Note: It asked me for credentials, use the cred's you logged into vSphere or ESXi Web-UI with!