update_post_meta() with a modified array?

Try this code:

 
function cf_description_to_content($post_ID){
    $data = get_post_meta( $post_ID, 'wiloke_listgo_my_custom_fields', true );
    // Put whatver description you want assign to the description field
    $data['description'] = $_POST['wiloke_listgo_my_custom_fields'];
    update_post_meta( $post_ID, 'wiloke_listgo_my_custom_fields', $data ); 
}
add_action('save_post', 'cf_description_to_content', 100, 1);

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