This is not currently possible to do on Thinkorswim. There are only two methods that could be used and neither of them are currently available:
- The PPS chart study would need to accept inputs for the prices used in it's computation. (it does not)
- The Study Filter of a custom scan would need to include an option for Heiken-Ashi candles (it does not).
As a result of item 1, this means that adding PPS study to a chart that is set to display Heiken-Ashi candles does NOT force that PPS study to use Heiken-Ashi candles for computing it's values. In fact when you set any chart to display Heiken-Ashi candles there are ZERO built-in chart studies that will use the Heiken-Ashi candles for computations.