I was going to make a filter for the "[Hot Network Questions](https://stackexchange.com/questions)" by excluding some sites from it.  I noticed [this answer](https://meta.stackexchange.com/a/93984/225764) which talks about "negative filtering" but does not explain how one can do it or if it is possible.  There does not seem to be a way to do this, though.  On the filter page, my only options are:

![on...][1]

So how can I do "All sites except [list]"?

It would also be nice if this could include similar functionality with the meta checkbox.  Something like "All main & meta sites except..."

  [1]: https://i.sstatic.net/aYGdO.png