Nah. Phones just gaslight you now.

https://urbo.com/content/this-is-why-your-phones-battery-isnt-really-at-100-percent/

The reality for most people is they charge their phone at night, and that's it. If the phone has a built in mechanism to stop charging at a certain percentage, you can use that, but otherwise it will just charge to 100%.

The only other option would be to have a smart outlet, and have your phone turn off the smart outlet when it hits 80%, which is an annoyance even if you know how to do it, and virtually impossible for tech illiterate people.

The next best thing is to make sure you aren't using a fast charger, as the heat from fast charging is arguably worse than charging it to 100%. And if it's charging over night, there is no reason for it to charge quickly.