Need help in scanner code for MACD Histogram

Part of my strategy is to pick moving stocks based on MACD Histogram crossover from negative to positive on a 30-minute chart. I’m unable to code it in the scanner unlike back-testing. Can someone provide code for MACD Histogram crossover 0 (zero) for my scanner? I can only use MACD and MACDSignal but it’s of no use for me. Is there any plan to incorporate MACDHistogram in Zerodha Pi (for scanner, not chart)?