It's often desirable to provide data along with a template that's uploaded to the online catalog. For example, for a table containing how many calories per hour a particular exercise activity burns. Such data exists independently of data the user would be expected to add, and might also be difficult for a user to find and enter themselves. Further, there may be more data than could reasonably be provided as code in a JavaScript field.

Of course, it would be reasonable to also expect a limit to how much data can be provided for the template.