Currently the Score Extension provides options to download a MIDI file or a generated lillypond file for an embedded score.
An example embedded score is on this page - https://en.wikisource.org/wiki/Page:The_Army_and_Navy_Hymnal.djvu/32
However, in this instance it would be nice to be able to take the generated score and produce print versions, the typical format being PDF. There is not currently an option to do this in the interface presented other than by using lillypond as an external tool.