Schema.org Markup for Products

I am having troubles passing the stock availability in my rich snippets.

If the product is in stock, the tag should be: <link itemprop="availability" href="http://schema.org/InStock" />

If it's out of stock, it should be: <link itemprop="availability" href="http://schema.org/OutOfStock" />

How can I add an if statement to _SKU_Man_Stock.cshtml to show the right tag depending on the availability?

I am using NOP 3.50. Thx!

Hi ,

I am using Nop 2.6 version, how can i approach schema.org markup for my site with automation process, anybody share detail information.

Thanks,
Venkat Goud