DOCX export filter options/embedding fonts

I’m using unoconv to convert ODT to DOCX, but would like to embed the fonts in the DOCX file. I can pass in export options to the filter, but I can’t find any documentation on what options DOCX has.

Is there some export option to embed fonts?

Otherwise fonts seem to be embedded when the Embed Fonts setting is set, can I set that from unoconv or some other API setting?