Hello @Martin K.
I guess this is not possible till now according to below statement.
You can configure any number of visit tags, but one tag must be configured to act as the primary visit tag. It is displayed in the visit name, and in the Visit tag column of the Visits dashlet and the Visitsweb view. You can also find the visit using the value of this tag. Select the Is primary check box for the required visit tag. All other tags then act as additional tags and can only be viewed in the Visit details web view.