From everything I have seen, this should be possible, but for some reason, I haven't been able to add System.Windows.Forms to a .Net 8 class library project. I need to add a custom cursor, which is the immediate issue, but I realized I will eventually want to add a form to this class library. I would have thought that I could add this through NuGet, but it isn't showing up. All I'm seeing online makes it seem like this should be nothing special. There aren't any instructions, because there clearly don't need to be, yet I'm not seeing it.

What am I missing?