Other chart supplier provide both the touch down zone slope and the average runway slope on their charts. In the case of the supplier we use it is on the approach chart in a small box with the runway info (depiction of approach lighting, runway dimensions, slope info, altitude in feet and hPa) usually between chart and profile view.
It might be possible to get the info from Jepp as well if you pay for it, if i remember we had it in our tailored airport booklets that jepp provided at some time (quite a few years ago though).