Question Viveport Unity XR Management Plugin?

What's the current process for using Unity XR Plug-In Management to deploy a build to Viveport? There is a plug-in for most platforms but not Viveport? Should I use the OpenVR SteamVR Unity XR Plugin as the build target for Viveport?

I can't see any mention of this in the Viveport help guide, just mentions manually importing the Viveport SDK to a Unity project which likely means keeping a separate Unity project just for the Viveport version as that is using the Legacy Unity XR Plugin format and not XR Plug-In Management.