my $json = encode_json(\@rawRecords);

##</code><code>##

my $typehint_person =  {
  lastname     => JSON_TYPE_STRING,
  firstname    => JSON_TYPE_STRING,
  age       => JSON_TYPE_INT};
my $typehint_persons = [ ($typehint_person) x @rawRecords ];
my $json = encode_json(\@rawRecords, $typehint_persons);