Action Hook before Product Subtotal in Woocommerce Cart and Checkout

I try to insert (hook) a custom row just before the first subtotal row in the cart page and checkout page with a function in my functions.php. I checked the official Woocommerce Hook Reference Site – no result so far.

i asked the question on wordpress developement – there you can See what i mean: http://wordpress.stackexchange.com/questions/227963/action-hook-before-product-subtotal-in-woocommerce-cart-and-checkout

https://wordpress.org/plugins/woocommerce/