Plugins in VS Code are significantly different than “standard” Visual Studio. I suspect someone would need to write this integration in order to get it working on the latter.
Author of the schema here - the YAML language server can talk to any editor that speaks the Language Server Protocol. I think VS is working on that. The schema is open source on JSON schema store. if you do any PR there (usually merged within a day) you will directly get the improvements in your editor.