How To? In Write, create relative link in output PDF

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From LibreOffice Write, I want to create a PDF with relative links (a link works on a local drive or on a web site, so does not specify a protocol). I know PDF has this capability as does HTML.

I LibreOffice Write, I've tried various hyperlinks, but the emitted PDF does not end up with a relative link. If I enter a document hyperlink, when I edit the link its changed to a http: or file: link which is wrong (maybe another LibreOffice bug ?).

Anybody know how to create a relative link that will be properly reproduced in exported PDF?

Thanks! Best Regards, Dave