Haven’t had any use for that, but quick look it uses GPIO pins that are in use, in fact, all of the GPIO pins are in use.
There is an API to get data. You can get request any combination of raw input data and scripted output data, for any time period, either in volts, watts or watt-hours. Beyond that, you are free to embellish or add to the API capability by coding your own handlers in the web server portion of the firmware. You cannot touch it though, data is intangible.