I believe that this is precisely the difference between the Pacer and the Pacer Pro. The Pacer Pro shows you ascents and descents as well as the lowest and highest points in the app. The current altimeter can probably also be placed on the watch face. The dial is generally freely customisable.
However, I have never used this function, it is enough for me to get the data at the end of a unit.

Yes, it has. After a run, everything can be analysed in the Polar Flow app. Including the incline.