Interesting question.
Please remember that PSS is not intended to be a replacement for UVM. I don’t know what you actually create from your requirements, but in order to use PSS, you will still need to have a UVM environment, including agents and a test. The PSS specification will allow a tool, such as Questa inFact, to generate UVM sequences that implement the test intent specified in your PSS, but you still need the rest of the UVM infrastructure to run it. PSS does not include the ability to create UVM agents/environments. You could perhaps use “exec file” blocks in PSS to create the UVM environment, but that’s just bookkeeping and you’d still need to define the UVM infrastructure.
That said, it would be valuable if you could use your stimulus/checking requirements to generate UVM (virtual/)sequences for your target environment because that would then allow you to reuse your test intent (the PSS specification) by using inFact to generate additional implementations of the PSS intent to target other platforms, like C-based tests for SoC simulation/emulation or FPGA prototyping.