Here's a different way of handling @EXPORT_OK

package XYZ;

use strict;
use warnings;
use Data::Dumper;

require Exporter;
our @ISA         = qw(Exporter);
our %EXPORT_TAGS = (
    'all' => [
        qw(
          Hash1
          Hash2
          Hash3
          )
    ],
);
our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
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