If that were an option (and I don't think it is...) you could do that through RAW Config (hold shift, right click on probe and open via RAW config).
However, if it isn't present there (I cannot check right now, sorry) you could run a pre-processing rule on it to automatically convert the string to whatever you'd like via the NAS and a Lua script. Or, even simpler, once it hits the NAS/AutoOperator Profile, you could suppress (make this one invisible) and automatically create a new alarm with whatever text you'd like.
Hope that helps,
Dustin