This show as a histogram
On top of that is a Moving Average of the histogram value, shown as a blue / red line with an option to hight these crossing and also crossing zero
Simple idea ; code open.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.