Manage “Low stock threshold” at Woocommerce products variations

I need to manage the “Low stock threshold” at Woocommerce products variations level, But default plugin (Woocommerce) does not have this functionality on product variations level.

It has a global level stock management Low stock threshold. But this is not what I want, because of my web full of variable/variations product. So I looking for a solution because I need to get notification about each product variation notification email when it hit the low stock threshold which I want to give.