How to avoid "this section" or "this document" in an introduction
Solution 1:
“Here we discuss” is fine. If you make it impersonal/ passive, it will be “What is discussed here...” The second sentence, at the same time, is impersonal. As you say, it could be, “Here, we won’t discuss the functionality.” Make sure that you do not violate instructions of the publisher, if it is a journal kind of manuscript.