New installations of LSWS won't have any external apps or script handlers. If upgrading from earlier versions, some external apps and script handler settings may be carried over. Sometimes certain lsphp versions, such as lsphp73 or lsphp74, may be missing. This is absolutely fine. You don't need to manually add them, since LSWS doesn't require them in an external app and will use either ea-phpxx or alt-phpxx automatically, as defined by cPanel MultiPHP Manager/CloudLinux PHP Selector.