Timestamp on last Blood Oxygen reading

I would like a timestamp like there is in SensorHistory.getOxygenSaturationHistory on Sensor.Info.oxygenSaturation or Activity.Info.currentOxygenSaturation (I have observed these two to be always the same, so I don't know which would be the best). When you run the Pulse Ox widget the time since the reading is shown, so it is not privileged information.

Just the number of minutes ago as is shown in the Pules Ox widget would be fine.

I have a Vivoactive 4, but I presume this would apply for all watches with a pulse oximter.

Thanks,
Michael