How do I publish nuget packages in GHES?

[RileyRobinson4]

I can't figure out how to publish NuGet packages to my GitHub Enterprise Server Instance.

From what I can tell, I need to locate an index.json file that points to the NuGet endpoints, but I can't find that file at any URL in GHES.

[RileyRobinson4]

Looks like the index.json file exists at nuget.HOSTNAME/USERNAME/index.json if I enable subdomain isolation.

However, when I try to push the package, I get this error:

PUT http://nuget.lair/riley-robinson/
NotFound http://nuget.lair/riley-robinson/ 184ms

However the PackagePublish section is this:
{
"@id": "http://nuget.lair/riley-robinson",
"@type": "PackagePublish/2.0.0",
"comment": "Push and delete (or unlist) packages."
}

So I would expect that this URL would work. Is Nuget actually supported in self-hosted GHES?