GL-AR300M: any thermal information available?

I've successfully installed OpenWRT 22.03.3 on a GL-AR300M (NAND version).

At the moment I'm about to configure luci-app-statistics, specially to display any thermal information.

There are no /sys/class/thermal/*/temp files, /sys/class/thermal is an empty directory.

Does this indicate, that there is no thermal information available, or do I have to install further packages (e.g. there is a package kmod-thermal)?