This is a workaround fix to an issue where chrome does'nt enable dark mode on linux even when systemwide dark mode is enabled.
Works on any linux distro.
Run the shell script below in terminal
sudo sed -i 's/^Exec=\/usr\/bin\/google-chrome-stable$/& --enable-features=WebUIDarkMode --force-dark-mode/' /usr/share/applications/google-chrome.desktop
sudo sed -i 's/%U/--enable-features=WebUIDarkMode --force-dark-mode &/' /usr/share/applications/google-chrome.desktop
Restart Chrome.
You have to run the shell script again after every chrome update. Only works on chrome stable version.