Hello Heiku,
You can use this expression :
CONCAT ( STRCALCUNIT ( {Property:Zone/Measured Area} ); "sq.m" )
Christophe - FRANCEArchicad Designer and Teacher
Archicad 15 to 27 FRA FULL
OS 13 Ventura - MacBook Pro M2 max- 32Go RAM
"Quality is never an accident ; it's always the result of an intelligent effort" John Ruskin