Device App with PulseOx and Respiration ???

We are doing a dedicated device App for tracking body parameters. Using VivoActive 4 devices.
Our App is simplifying the watch GUI and just shows limited info-screens and does not allow access to settings.

Now we wanted to add informational screens about PulseOx and Respiration (Current and History) - and could not find any way to get the values via SDK - PulseOx we see, but get 0 values back. Respiration current and history values we could not find any method at all to get that.

Did we miss something ?