Ability to apply free shipping to specific SKUs or product types

We would like the ability to create a campaign that applies free shipping only to specific SKUs or specific product types, rather than to all products in the store. This would give us more control over which items qualify for free shipping within a promotion. Having this flexibility would help us run more targeted campaigns based on the products we want to promote. If this would be helpful for your store as well, please upvote this request!