Please reread the docs you linked to :} Under Console Availability
it says this:
The Package Manager Console is built into the Package Manager for Visual Studio on Windows. Visual Studio Code and Visual Studio for Mac don't include the console. Visual Studio for Mac has a UI for managing NuGet packages, and the equivalent console commands are available through the NuGet CLI. For more information, see Install and manage NuGet packages in Visual Studio for Mac.
It would have been nice if they had marked that section as important so it stands out. Perhaps you can provide feedback on that page to let them know it is not at all obvious it isn't available for Mac when embedded inside the larger paragraph so that others won't struggle finding it as well.