This requires extending .uno:FillColor with a new parameter, and then merging that parameter into the fill color item in sd/. The sidebar's color picker already generated these parameters. Change-Id: I83e3c4fc37b8d7bd34f0ef9c0cb96e164f7f0b99 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/132646 Tested-by: Jenkins Reviewed-by: Miklos Vajna <vmiklos@collabora.com>