Yeah, no such thing in Cubase. I think it is possible as some built in exclusive DAW feature, but it is not a VSTi standart.
You can draw some random curves in automation lines fields.
For example to replace FL Studio’s patcher, I draw different lines for different parameters for envelopes of an VSTi, than render selection and put it into sampler.
Or you can search VSTi that has built in randomization, Massive has it or Atlantis.
Randomness for delay/reverb feedback, I doubt it has some artistic value though. If feedback in delay goes under 0 and than back to 100 you will hear nothing, the delay’s buffer is empty now because feedback was near 0.