I use this for setting the smbios thermal mode on my Dell XPS13 2-in-1 7390.
Currently this is impossible. Thermal calls aren't whitelisted in the linux kernel. Check dell/libsmbios#68 for further informations.
Clone the git repo
git clone https://github.com/SebastianLuebke/smbios-thermal-ctl-gnome-ext.git ~/.local/share/gnome-shell/extensions/smbiosthermalctl@luebke.io
reload gnome by pressing alt + F2 and enter r
https://extensions.gnome.org/extension/3276/smbios-thermal-ctl/
Feel free to submit a pull request or consider making a donation on Flatter.