Thank you! Looking over at Capture::Tiny's doc, I found tee. Which is exactly what I needed. Output both to STDOUT and store in a variable for later use.
#!usr/bin/perl
use strict;
use warnings;
use Capture::Tiny qw(capture tee);
my ($stdout, $stderr, $exit) = tee
{
system('ls', '-l');
};
print $stdout;
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