Is it possible to read hap ac2 and ac3 input voltage?

I have couple hap ac2 and it doesn’t have /system/health output at all.
I have a power supply that stopped working and I wanted to read the voltage so I would know before something fishy is going with the power supply.
However compared to other devices it seems like it doesn’t have the input voltage reading at all.
I have tried the same on hap ac3 and they don’t have any health output (7.4).

I wanted to verify if there should be any health information on these boards and if so, where in the specification it appears?

product page shows all the info, scroll down and check peripherals and other

hap ac2
https://mikrotik.com/product/hap_ac2

hap ac3
https://mikrotik.com/product/hap_ac3