One of the options that you have is to link to remote URI, or import a file. A file can be a JSCON, CSV, or XML. What importing or linking does is resolves the link of file and puts the text within the editable text box below the choose file button where you can edit it directly as needed.
These formats can be imported via
Wiki: Description
Wiki: Edition
Wiki: How To Use
Wiki: MaterialsTab
Wiki: importmaterial