Unfortunately,PrestaShop's native editor does not support the title attribute for links and offers few options for customizing them in both product descriptions and CMS. This limitation persists even in cases where our PrestaShop is integrated with high-quality page builders such as Elementor since the Text Editor always uses Tinymce. This shortcoming is especially noticeable comparing with WordPress, where the editor not only allows the use of the Title attribute in links, but also offers many other advanced features. So we will be forced to use HTML when we want to insert a title attribute in a link, or to use forms that allow to extend the functionality of the native editor.
So to be able to use this attribute you need to extend native editor of PrestaShop, there are several modules that allow you to extend TinyMCE overcoming the limitations of the basic version. However, I remind you that the use of this attribute is very rare and should be moderated.