Allow {{#get_file_data:}} and {{#get_web_data:}} to enter archives.
The url or filepath should be automatically recognised as either leading to a regular file, or consisting of a path to an archive followed by a path within the archive.
For {{#get_file_data:}} this behaviour should be (dis)allowed in the extension settings per configured datasource; for {{#get_web_data:}}, in general.
In addition, the size of archive to unpack should be limited in the extension settings.