Hi @irenehofer,
Yup, it’s possible; there’s a few different strategies.
One you could use something alone the lines of:
$count = count( get_field( 'spalten' ) );
echo $count;
To then concatenate + create the class name you’d like and then echo it where desired.
A more elaborate way is detailed in this thread, if you want to check that out as well. Let me know if there’s anything I can clarify!
