Panel Statusmap - how to set a milestone into timeline

I’m working with Grafana v6.0.2 and PostgreSQL.
Currently I’m trying to put a single date onto the x-Axis of the panel Statusmap. This works so far, but I’d like to have the date shown as a milestone and not as a bar. For reference please see also the attached picture.

Is this possible with this panel or do I have to use another one?

Thank you in advance!!


Maybe with this: