Free Shipping Options In Mv

So there is a in-built free shipping option in cs-cart I could use it to either provide Free shipping worldwide or Free shipping in a specific country using shipping method.

I would like to give my vendors options to offer either:

1) Free shipping worldwide


2) Free shipping {vendor country}

And depending on which option is picked during product posting the text "Free Shipping Worldwide" OR "Free shipping in US" shows on product card.

As I said I could do this today but I can offer only one of the two options NOT both. The reason why I need this is because some of my products are small that can be shipped free worldwide but the bigger items can only be shipped free in the US