[cflsystems]

I am sure you can. You have to see how the product has the button and what params passes to it for the action "add to cart".
However it may be a little bit tricky to do that for each variant - depends where you have the list.
XC is coded so almost the whole page is inside "form" tag - this was mentioned to them years ago as something that should not be this way but it is still like this. They may never fix it. You will have to have the list outside the form for starter and then call the add to cart widget for each item in the list with its own parameters.