It can be easier :) Define your hash in eg. My_var.pm:

package My_var;
use strict;
use warnings;
our $test = {

            'hash1' => {
                        'paramA'     => '00' ,
                        'paramB'      => 'FF' ,
                       },
                       
            'hash2' => {
                        'paramA'     => '01' ,
                        'paramB'      => '02' ,
                       },
            
            'hash3' => {
                        'paramA'     => '00' ,
                        'paramB'      => '03' ,
                       },
                       
        };

1;
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Mind "our $test;" and "1;" at the end of package file. Info on our.

In your script, just include the package

#!/usr/local/bin/perl
use strict;
use warnings;

# CPAN package
use Data::Dumper;

# private package
use My_var;

print "$My_var::test->{hash1}{paramA}\n";
print Dumper( $My_var::test );
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Output:

00
$VAR1 = {
          'hash1' => {
                       'paramB' => 'FF',
                       'paramA' => '00'
                     },
          'hash2' => {
                       'paramA' => '01',
                       'paramB' => '02'
                     },
          'hash3' => {
                       'paramB' => '03',
                       'paramA' => '00'
                     }
        };
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