How to install Cross-Platform .NET Standard Plugin Templates extension in vs 2019 to create a nuget package?

I need to create a nuget package using my iOS .framework. I am using VS 2019 and started referring this link. And it says

Download and run the Cross-Platform .NET Standard Plugin Templatesextension for Visual Studio. These templates will make it easy tocreate the necessary project structure for this walkthrough.

But this is missing in the provided link and I cannot even find it in the market place.

So I cannot complete this steps that they have provided

In Visual Studio 2019, File > New > Project, search for Plugin, selectthe Cross-Platform .NET Standard Library Plugin template, and clickNext.

How can I install this to create nuget package? Or else is there any other way to do this? I want to create a nuget package from an iOS .frameworkPlease help meThanks in advance.