Thank you for your interest in our product.
We are planning to release our ‘Essential UI Kit for Xamarin.Forms’ as a separate plugin along with the mentioned ‘Visual Studio extension’ that you are trying to use. Please refer the below blog which has more details for your reference.
As we stated in the blog, the complete source code for Essential UI Kit will be published in GitHub by next week. We will also publish a demo app in Play Store to make it easier for you to review all the screens.
Please let me know if you need any further assistance.