Libreoffice command line parameters

Problem: When exporting odt to pdf via the GUI, you have the option "Verknüpfungen → URLs relativ zum Dateisystem exportieren". Without that options, LibreOffice apparently converts relative file names like "../Unterlagen/Foo.pdf" to absolute path names pointing to the location where the temporariy file is located, i.e. /tmp/Unterlagen/Foo.pdf".
Question: How can that option be set via the command line?

https://ask.libreoffice.org/en/question/68775/change-default-resolution-in-batch-png-conversion/ gives a first hint about the syntax of that parameters:
"png:writer_png_Export:resolution=300" in a similar example
https://listarchives.libreoffice.org/global/users/msg45846.html indicates that there are some output filter options, and indeed the magic string for the pdf output seems to be "writer_pdf_Export"
https://listarchives.libreoffice.org/global/users/msg45848.html and https://bugs.documentfoundation.org/show_bug.cgi?id=36313#c17 indicate that the pdf exporter has a lot of undocumented options, the hint is "read the LibreOffice source code"
Hier befindet sich eine Liste von Optionen: https://wiki.openoffice.org/wiki/API/Tutorials/PDF_export#Links
- ExportLinksRelativeFsys unter Links dürfte die gesuchte sein

Die Option steht (bei mir) in /usr/lib/libreoffice/share/registry/main.xcd, im Knoten component/Filter/PDF/Export