Check if the Custom TAB is set programatically

Hi,

I am using your plugin to show a custom tab on our webpage.

I need to check programatically that the tab, title, description is set outside the plugin.

I have tried:

$drugon_recept = get_post_meta( $product->id, 'frs_woo_product_tabs', true );
$drugon_recept = get_post_meta( $product->id, '_wc_custom_product_tabs_lite_tab_title', true );
$drugon_recept = get_post_meta( $product->id, '_wc_custom_product_tabs_lite_tab_content', true );

but they are returning nothing.

Thanks,
beamkiller.

https://www.ads-software.com/plugins/woocommerce-custom-product-tabs-lite/