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?

Thank you for sharing your wonderful work!

I was wondering if I could use these kind of 3d plots in Time-varying Cox model not just for time vayring effects of some variables.