Device settings request

Based on a prescription, we would to request for a device settings, let’s say a Sipap.
Should we use the service request? in that case where to put the pressure settings?

I guess DeviceRequest.parameter with a code for pressure and a valueQuantity or valueRange for the actual pressure or pressure range.

Thank you Richard for your answer!
We have settings with prescription and also settings adjustment during visit without prescription. As a result we used DeviceRequest.parameter for the first case and added an extention in Procedure.focalDevice.parameter for the second one.

best regards