Netduino Plus 2 - Mac Setup with Visual Studio 2019

Hi Guys,
I have recently purchased a Netduino Plus 2 and I am currently doing the setup on a MacBook pro using Visual Studio 2019.
I am stuck as I can not find the .NET Micro Framework extension in the Visual Studio 2019 Menu>Extensions>Gallery.
This extension is not in the list which means that I can not install it.
Could you please assist? Is there a way to install in Manually since I can not find it in the extensions menu?
Your help would be greatly appreciated.
Many Thanks,