Is there a way to prevent certain Asset elements from being included in a unity package?

I am getting ready to prepare an asset for the Asset Store. My asset is a generator that uses a bunch of templates stored as text files. These elements are required for the generator (which is set up as a Unity script), but once they are used to generate some data for a Unity project, they aren't needed for the end-users asset. Is there a way to flag these elements so that they aren't included in the end user's unity package?