Doesn't the data look close to a data structure already? A few regexes and an eval ...
#!/usr/bin/perl
use Data::Dumper;
use strict;
use warnings;
local $/;
my $data=<DATA>;
$data=~s{\[}{[qw(}sg;
$data=~s{\]}{)],}sg;
eval '$data=\['.$data.']';
warn Data::Dumper->Dump([\$data],[qw(*data)]).' ';
__DATA__
[
abc
def
]
[
ghi
jkl
mno
]
and we have ...
$data = \\[
[
'abc',
'def'
],
[
'ghi',
'jkl',
'mno'
]
];
at pmdata.pl line 13, <DATA> chunk 1.
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