Hello Heiku,
You can use this expression :
CONCAT ( STRCALCUNIT ( {Property:Zone/Measured Area} ); "sq.m" )
Christophe - FRANCEArchicad Designer and Teacher
Archicad 15 to 26 FRA FULL
OS 11.6 Big Sur - MacBook Pro 2015 - 16Go RAM
"Quality is never an accident ; it's always the result of an intelligent effort" John Ruskin