In that case you need to register that hook by code. Just put the below code in the constructor and load your page. Then you need to remove that code again
$this->registerHook("hookname");
Since this is a hassle and if the site is live you need to upload the files. You can avoid that hassle with this module https://codecanyon.net/item/generate-hooks-for-prestashop/30937295?s_rank=1
Regards
SmartDataSoft