Like the post mentioned at How to get uwpcore template? - General - Community | MonoGame, it’s also missing the uwp core project.
When I tried to install from the CLI, it gave this error:
Error: Failed to load template from C:\Users<UserName>.templateengine\packages\MonoGame.Templates.CSharp.3.8.1.303.nupkg(/content/content/MonoGame.Application.UWP.CoreApp.CSharp/.template.config/template.json):
Missing ‘identity’.