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$data_array_ref = [
    mykey1 => {firstkey => 'firstvalue', secondkey => 'secondval' },
...
}

__END__

output
======
...
ARRAY(0x1ab5148) =>ARRAY(0x1ab50d0)
mykey4 =>
ARRAY(0x1ab52f8) =>ARRAY(0x1ab5190), ARRAY(0x1ab5208), ARRAY(0x1ab5280
+)

$data_array_ref = [
    mykey1 => {firstkey => 'firstvalue', secondkey => 'secondval' },
...
mykey2 => turtle, Dennis
mykey3 => one, two, three
mykey4 => 4, 5, three, 6, 7, four, 8, 9, five