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Do you mean to open a new Heikin Ashi chart, or to toggle the existing charts setting?
To open a new one, the best way to do that currently would be to create a Chart Layout for HA Candles, then add a button to the custom tool bar for that layout.
There is no toggle action you can reference for candlestick charts already open, you go to the charts properties to tick / untick the HA checkbox.