printing stream columns

I'm trying to print the record type for each log stream at startup.
Something like:

 for ( id in Log::active_streams ) {
                 local stream = Log::active_streams[id];
                 print stream$path, stream$columns;
}

doesn't work because $columns is a record type, and gets stringified "<no
value description>".

Is there a way to do this in zeek script?

Thanks,
Henri

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