Add "quantity" to attributes

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I would like to add a customized length field with price impact and i want to keep the quantity textfield.

This is how i wont it to work:
Add a textfield that multiplies the selected attribute and makes impact on the price on the fly.
I want the number to be displayed between "Groupname": and "Attrebute" in the cart.

I've added some pictures

I only need the code then i can implement it myself.

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