Retrieve base hyperlink as document property

[sda030]

I recently learned that Word allows storing the base URL used for relative hyperlinks in the document. I am unable to retrieve this document property using officer::doc_properties()

https://support.microsoft.com/en-us/topic/how-to-create-absolute-hyperlinks-and-relative-hyperlinks-in-word-documents-d6339b5a-98ba-a483-bac5-95bd33ff5a80

Which also means I am unable to set it programmatically since I do not know the name of the tag is. It is stored in the docProps/app.xml under the tag HyperlinkBase. I tried a naive officer::set_doc_properties(HyperlinkBase = "github.com") but that did not work (unsurprisingly).

Example:
test.docx