Is your feature request related to a problem? Please describe.

I would like to be able to filter on class specialisations as a syntax in the advanced filters. It is very unlikely that m+ keys want 2 of the same spec in the groups, so I would like to not spend time looking through groups that have my own specialisation in it already.

Describe the solution you'd like

A syntax code similar to the class one, i.e. instead of "Shamans = 0" or the like, I would like to have "Shaman enhancement = 0" or "Enhancement = 0" , etc.

Ah, didn't realise. Thanks!

Already possible: https://github.com/0xbs/premade-groups-filter/wiki/Keywords#specialization
To show only groups without enhancers: enhancement_shamans == 0