You'd need to take a reference (a hashref) to the %struct hash. E.g.

my %struct = (data => 1, pointers => []);
my $struct_ref = \%struct;
[download]

Or, in a single step:

my $struct_ref = {data => 1, pointers => []};
[download]

Note the reference is a SCALAR value (uses $ sigil). There's nothing special about using these in an array:

my @array_of_structs = (\%struct1, $struct2_ref, {data => 1, pointers 
+=> []});
push @array_of_structs, \%new_struct;
[download]

Access the hash data like this:

my $first_data = $array_of_structs[0]{data};
push @{ $array_of_structs[2]{pointers} }, 'abc', 'def';
my $third_struct_second_pointer = $array_of_structs[2]{pointers}[1];
[download]