It seems I don't have it and it is a big deal to get something we don't already have.

Unless it is a big deal to install the .pl you are writting, you should have no problem also installing Text::Table. Given that Text::Table is a pure Perl module with only pure Perl dependancies, there's no difference between installing your script and installing Text::Table.

But I wrote up an alternative anyway

use strict;
use warnings;

use List::Util qw( max );

sub get_max_widths {
   my ($titles, $aoa) = @_;

   my @col_widths;
   foreach my $row ($titles, @$aoa) {
      foreach my $col_num (0..$#$row) {
         $col_widths[$col_num] = max(
            $col_widths[$col_num] || 0,
            length($row->[$col_num])
         );
      }
   }

   return \@col_widths;
}


sub get_formatter {
   my ($col_widths, $justs) = @_;

   if (@$col_widths > @$justs) {
      $justs = [
         @$justs,
         'L' x (@$col_widths - @$justs),
      ];
   }

   my $fstr = join '  ',
              map { '%'
                  . ($justs->[$_] eq 'L' ? '-' : '')
                  . $col_widths->[$_]
                  . 's'
                  }
              0..$#$col_widths;

   my $args = join ', ',
              map { ($justs->[$_] eq 'C'
                       ? "center(\$_[$_], $col_widths->[$_])"
                       : "\$_[$_]"
                    )
                  }
              0..$#$col_widths;

   return eval "sub { sprintf('$fstr', $args) }";
}

sub center {
   my ($text, $size) = @_;
   $size -= length($text);
   return $text if $size <= 0;
   my $s_half = int($size / 2);
   my $b_half = int(($size+1) / 2);
   return (' ' x $s_half) . $text . (' ' x $b_half);
}

{
   my @titles = (
      'TITLE',
      'DATA-A',
      'DATA-B',
      'DATA-C',
   );

   # (L)eft, (R)ight or (C)enter
   my @title_justs = ('C') x @titles;
   my @justs       = ('L') x @titles;

   my @data = (
      [ 'How are you', 'item1',  'item2',  'item3'  ],
      [ '',            'item1a', 'item2b', 'item3c' ], 
      [ 'I am fine',   'item4',  'item5',  'item6'  ],
   );

   my $col_widths = get_max_widths(\@titles, \@data);

   my $title_formatter = get_formatter($col_widths, \@title_justs);
   my $row_formatter   = get_formatter($col_widths, \@justs);

   print $title_formatter->(@titles), "\n";
   print $row_formatter->(@$_), "\n"
      foreach @data;
}
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