It uses the original open/high/low/close and combines them as you would the original hlc3 calculation, but separately, to draw the candles as a shadow of the current price.
There are a few parameters to make it more flexible: source, resolution timeframe, length, and moving average length.
Length (default: 5) will determine the candle calculations, cumulative sum of the past X bars.
Moving Average Length (default: 9) will determine the ( ) length for the true (hlc3*volume/cumulative )
Source will change the Moving Average from hlc3 to whatever you want.
Resolution will attune the candles and Moving Average line to a different periodicity.
Just to be a pain, I also included the old from Trading View, as a comparison. You can disable it from the Style settings.
Enjoy and happy trading!