It’s doable, but it can’t be done in many cases without false positives.
In the French language, we don’t add a dot at the end of a sentence if it’s a title.

And as there is no way for Grammalecte to know if the text is a title, we can only guess an ending punctuation is missing when there is another sentence before the last sentence in a paragraph.

With “C’est le matin. Pierre mange du pain”, we can assume it’s not a title.
With “Pierre mange du pain”, we don’t know if it’s a title.