Like all the tooltips in HikaShop, this tooltip text comes from a translation key. This one is in the plugin language file. And thus, like any translation key, you can override it if you want to change it.
You can follow this:
guide.joomla.org/user-manual/languages/l...s-language-overrides
So it's normal there is no setting. And the tooltip will appear automatically. No change is needed.