Add widget position in Yootheme Pro

config.php

<?php

// Create a file config.php with this code in put in child theme

return [

    // Set theme configuration values
    'theme' => [
        'positions' => [
            'header-top' => 'Header Top',
            'header-bottom' => 'Header Bottom'
        ]
    ],

    // Register event handlers
    'events' => [
		'init' => function ($app) {
			$app->theme->options['positions']['header-top'] = 'Header Top';
			$app->theme->options['positions']['header-bottom'] = 'Header Bottom';
		},
    ]

];