That key on the French keyboard is not really an apostrophe, it is mainly there so you can easily add accent marks to the preceding letter. If you type I, o, or u, you will see that it changes to ^, and if you type a it changes to `. You would not want that behavior in Ukrainian.
In any case, to ask Apple to add the feature you want, you need to go to
Product Feedback - Apple
Also when you do that, it would be good to explain why the apostrophe is important, because they seem pretty rare in the news webpages I have looked at like
https://www.ukrinform.ua