Your question is highly unclear. Please provide some code that shows what you are trying to do.

As a start, maybe the following does what you need?

my @list= ('key1', 'another_key', 'the third');

my %entries= (
    'key1' => 'number one',
    'another_key' => '2',
    'the third' => "three's a crowd",
);

print $entries{ $list[ 2 ] };
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