Setting or App that allows battery discharge while plugged in

I recently bought an MSI gaming laptop and use the Thunderbolt 3 port for charging. However, this now keeps my laptop plugged in at all times, since I am also running all usb's and aux monitors through this connection.

I had a laptop (maybe 10 years ago) that had a feature that allowed the battery to discharge from 100% to 80% while plugged in. It exercised the battery...

Is there a setting like this or an app that would accomplish the same thing?

thank you

After 10 years batteries have moved on some what and as far as I know don't need "exercising"