Not really possible without somebody writing a new addon. Blizzard classifies nameplates 2 ways only - "Friendly" and "Not Friendly".
Some addons (ie TidyPlates:ThreatPlates) "hide" nameplates for neutral mobs (it determines neutral via other methods). I know of no addon that allows the kind of control that you're asking for.
I am not sure if offered as such by either addon, but there are features which perhaps could work towards such an implemention in two addons.
Tidyplates supports a handful of "special" nameplates where they have modifications in addition to those offered in general based on the current hostility. Totems, certain quest mobs like the crabs in sw canal etc.
DocsNameplates seems to offer the likes of friends/guild highlighting and so on, so since they are both offering further enhancements on a per nameplate basis then the authors of those may be someone to approach with that suggestion.