Things3 URL Scheme used to Filter *out* a tag


Is there a way in the Things3 URL scheme to create a view of Today with all tasks apart from ones tagged with a specific tag. i.e filter out a certain tag?

I’m trying to create a Shortcut to show my Today tasks but not showing ones tagged with “on-going”.

An alternative would be to show my Today view filtered on tasks with no tag but I can’t find a way to do that either?