@greg28818, In order to add content dynamically some customizations, are required which handle such scenario dynamically. however, if you're not a developer then another way is to use Widget, over there you have to manage things manually. Create a new widget, select a static block, in layout option choose your product type and choose your products where you want to show this message. Hope this helps.!
Cheers
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Magento Programmer | Was my answer helpful? You can accept it as a solution.