CPU temperature not available
Q: CPU temperature is not displayed by the app, is that normal?
A: CPU temperature is not a standard information in Android world. That is to say availability of CPU temperature depends on device manufacturer.
Q: Is there a way to add support for CPU temperature?
A: Maybe, that data if available is in most cases stored under /sys folder on the device. Any file utility with a search feature can be used to locate any file with 'temp' in its name.
With that list of files (and their content), please send a support request from the app settings. The data will be reviewed and you will be provided with a definitive answer as to whether CPU temperature support can be added for your device.