Health app blood pressure graphs

The graphs for blood pressure on the Health app default to having axis lines every 50mmHg, which is generally good practice for graphs. However, when trying to interpret blood pressure it kinda makes the graphs useless since the general cut off for high blood pressure is 130mmHg/90mmHg and optimum blood pressure being 120mmHg/80mmHg. It makes it hard to see how well you are actually doing because there is no line to distinguish normal blood pressure. Low blood pressure would also be hard to distinguish since the general cutoff is 90/60.

Is there a way to change this or is there another way for me to try to get this noticed so it can be changed on later versions of the app?

I included a screen shot to show you how hard it is to tell