In my experience an application vendor needs to specifically offer a CLI install method that asks for a product key at some point to automate entering the product key. Even then the product key would need to be passed as a variable or parameter. You could in theory use more scripting to prompt the user to enter the product key, or read a key file put on the device ahead of time. However, the vendor would still need to support this in their installer binary.
Not knowing what the application is the best I can recommend is reaching out to the vendor and see if they have any programmatic methods to include product keys with an install. Maybe if they have a deployment guide this information will be included.
