MathPlugin in skprompt.txt file [Semantic kernel]

Console.WriteLine("Enter numbers: ");

var input1 = Console.ReadLine();
var input2 = Console.ReadLine();

var result = await kernel.InvokeAsync(prompts["math"], new() 
{
    { "input1", input1 },
    { "input2", input2 }
});

Get me the sum of passed numbers:

{{ MathPlugin.Add value=$input1 amount=$input2 }}

Assistant: