How to set dynamic $parent_id with 'getSelectablePages' instead 'findPagesCode'

[update AG]

Until now, I have set $parent_id in page selection fields (InputfieldPage) that have different root directories depending on the page being edited, with the following hook:

$wire->addHookAfter('InputfieldPage::findPagesCode', function($event) {
    if(substr_count($event->object->name, 'select_focus_page') > 0) {
        $page = $event->arguments('page');
        $return = $event->return;
        $parent_id = wire('input')->id;
        $event->return = wire('pages')->get($parent_id);
    }
});

Now I see in inputfieldPage.module that the function 'findPagesCode' is deprecated. We are supposed to use the 'getSelectablePages' function instead.  However: I haven't figured out how to use 'getSelectablePages' to set the $parent_id with a hook. Has anyone had more success with this?

Translated with www.DeepL.com/Translator (free version)

[kixe]

Make child pages of page beeing edited selectable in a page field named: nameOfTheField

$wire->addHookAfter('InputfieldPage::getSelectablePages', function($event) {
	if($event->object->hasField == 'nameOfTheField') {
		$event->return = $event->pages->find('parent=' . wire('input')->get->id);
	}
});