extend-bricks-settings.php

<?php

add_filter('builder/settings/page/controls_data', function ($data) {
    $data['controlGroups']['landing-page-options'] = array(
        'title' => 'Landing Page Options',
    );

    $data['controls']['testField'] = array(
        'group' => 'landing-page-options',
        'type' => 'text',
        'label' => 'My Test Field',
    );

    return $data;

});

?>