Any techies tools available on android able to read up the voltage charge /discharge by second from your kernel*
Through drive permission, such x as 3c toolbox and ROMtoolbox

Meanwhile, xxternal voltage reader used to read the flow through such input output device

Lenovo phone come with native feature through tapping your battery setting iinm

As for the hoax folks roams around

Important thing is to just have
Charger with highest ampere, device that could withstand such input through their charger port
Qualcomm device mostly able to have their stuff charge in a lightning speed

While the cable play a small role as the the loss efficiency rate are minimal, lain la klu korg charge kabel 4 5 meter

Keyword,
Proper charger/powderful device / charger port capability
It's been discussed on xda