Is it possible to add ACF option page under an existing custom plugin?

I checked the documentation but I did not found a way how to do it

add_action('acf/init', 'my_acf_op_init');
function my_acf_op_init() {

    // Check function exists.
    if( function_exists('acf_add_options_page') ) {

        // parent.
        $parent = 'should be the custom plugin entry'

        // Add sub page.
        $child = acf_add_options_page(array(
            'page_title'  => __('Social Settings'),
            'menu_title'  => __('Social'),
            'parent_slug' => $parent['menu_slug'],
        ));
    }
}