This page should prevent a session from sleeping in Chrome 84+.

Windows shortcut to open a small window.

"C:\Program Files (x86)\Google\Chrome\Application\chrome_proxy.exe" ^ 
--chrome-frame --user-data-dir="%tmp%\chrome_tmp_user_dir" --window-size=100,100 ^
--window-position=1,1  --app=https://dchin.me

wakelock.lnk.

Run this in cmd to verify wake lock

powercfg /requests