# Array
@a = (1, 2, 3);

# Hash
%h = (param1 => 100, param2 => 200);

# Reference to array
$r = [ 1, 2, 3 ];

# Hash of lists (HoL) - probably what you need
%h = (
    param1 => "ABC",
    param2 => [ "value1", "value2", "value3" ]
);