The data is serialized. You can try an online editor like this one (just use JSON), otherwise you can do it with a little PHP:
$data = unserialize( $your_serialized_data );
$data['this'] = 'that';
echo serialize( $data );
The data is serialized. You can try an online editor like this one (just use JSON), otherwise you can do it with a little PHP:
$data = unserialize( $your_serialized_data );
$data['this'] = 'that';
echo serialize( $data );