Add ACF settings page under selected menu item

ACF_settings_to_selected_menu_item.php

<?php // ommit this line

/**
 * @snippet      Add ACF Pro settings page under a menu item of your choice
 * @comment      In case you'd like to add your option page to the CPT, under posts or whatever location you'd like
 * @source       https://kybernaut.cz/clanky/wp-multisite-maximalni-velikost-nahravaneho-souboru/
 * @author       Karolína Vyskočilová (https://kybernaut.cz)
 * @testedwith   WordPress 5.0.5
 */
// -------------------

if( function_exists('acf_add_options_sub_page') ) {  

   // add sub page
   acf_add_options_sub_page(array(
       'page_title'     => 'Title of your custom option page',
       'menu_title'     => 'Menu title',
       'parent'     => 'edit.php?post_type=YOUR-CPT-GOES-HERE', // works as normal parent_slug from https://developer.wordpress.org/reference/functions/add_submenu_page/
        'capability' => 'manage_options'
   ));
   
}