ext_localconf.php

<?php

defined('TYPO3') or die();

(function () {
    \TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
        'go_maps_ext',
        'Show',
        [
            \Clickstorm\GoMapsExt\Controller\MapController::class => 'show, preview'
        ],
        // non-cacheable actions
        []
    );

    $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['cms']['db_layout']['addTables']['tx_gomapsext_domain_model_map'][0] = [
        'fList' => 'title,default_type',
        'icon' => true
    ];

    $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['cms']['db_layout']['addTables']['tx_gomapsext_domain_model_address'][0] = [
        'fList' => 'title, info_window_content',
        'icon' => true
    ];

    // here we register "tx_gomapsext_double6"
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tce']['formevals'][\Clickstorm\GoMapsExt\Evaluation\Double6Evaluator::class] = '';

    // add costum backend form elements
    $GLOBALS['TYPO3_CONF_VARS']['SYS']['formEngine']['nodeRegistry'][1580467607] = [
        'nodeName' => 'GomapsextMapElement',
        'priority' => 40,
        'class' => \Clickstorm\GoMapsExt\Form\Element\GomapsextMapElement::class
    ];
})();