rps in throttle as a fraction

hi

is there a way to set rps in throttle as a fraction like below

Scenario1.inject(
rampUsersPerSec(1).to(30).during(120 seconds)).throttle(reachRps(0.5) in (10 second), holdFor(duration minutes)),

i need to run a particular scenarion only 0.5 requests per second, how do i run it?

Please help me with this