[Therion] How to suppress station name prefix?

Hello, my stations all follow the syntax „n.m“, like 1.28, 1.29, 2.1, 2.2 and so on. I have some larger maps where only the first prefix (1.m) ever occurs. Is there a way to supress the prefix when needed without tinkering with the data? I think in the direction of overloading the station name symbol but dont know how to code this in metapost... With best regards, Beni