I found a great web based monitoring tools for this smart plug, and I will share my method running this tools in Raspberry Pi (with DietPi).
Read more about this tool here: https://github.com/jamesbarnett91/tplink-energy-monitor
There are few method to run this, but I found that using Node+NPM is the easiest for this platform.
apt install git npm
git clone https://github.com/jamesbarnett91/tplink-energy-monitor && cd tplink-energy-monitor
npm install
npm start
Once installed and run, go to http://server-ip:3000