I think that the chances of this happening in Roon are very small, so can I make a suggestion. There are spectrum analyser apps available for the iPad for example (I use one by Dynaudio). Running one of those whilst tweaking Roon EQ on the same (split screen?) or another device would be a workaround of sorts. Roon EQ isn’t real-time though (in that the music interrupts every time you change a setting) and I can’t see that changing.
Also, depending upon your setup, there are ways of piping Roon’s output to software RTAs running on the same device:
Plenty of request threads for this if you Search.