Be Able to Add Sales Templates to Marketing Studio Assets

I know you can add one-to-one emails to a Marketing Campaign in Marketing studio (but you have to add each one individually sent to people). I can add a sequence to a marketing campaign, but I would love to be able to add individual sales templates. This would be so helpful in tracking specific templates we have without having to build a sequence. For example, we have a sales template going out for a National Holiday that sale’s should be sending to contacts individually. Its one email and doesn’t need a sequence, but I would love to include this template in the campaign so I can see all the data in one place.