Hi. It's simply histogram that shows divergence between the lines of the Chande Kroll Stop ind (built-in TradingView ind). I noticed that the lines intersect or are very close to each other if the volatility decreases. You can use MA like the main line or just 5, 10 lines how I do. Sorry for code Im not a programmer
Chande Momentum Oscillator script.
This indicator was developed and described by Tushar S. Chande and Stanley Kroll in their book "The New Technical Trader" (1994, Chapter 5: New Momentum Oscillators).