Hazard ratio plots with non-linear & time-varying effects in R

Laaaate answer here, but does not a hazard ratio imply that we have two numbers?

That is why I thought this should be labeled partial hazard and not a ratio. I.e. if we extract to values from the curve we can calculate the ratio, but if not the curve displays some hazard function? I must confess that I am a bit out of my element here, but this is how it was explained to me.

Have you solved this problem? How did you solve it? Can you share it?