Setting bookmark to always open in private windows

[pedja]

There are some sites that users want to always access using private windows.

Can option to bookmarks be added to set specific bookmark to be open in private window by default? That would help people not to mistakenly forget to right click and open in private window.

[LonM]

Dupe of https://forum.vivaldi.net/topic/26320/private-mode-for-bookmarks