Set alerts of Moving Average indicator to notify changes in the indicator's input series (not always closing price).

The Moving Average indicator (and EMA indicator) fires alert notifications only against closing price irrespective of the input series to the moving average specified by the trader.

To take a simple example, if a trader applies volume as the input to the Moving Average indicator on their chart any alert the trader permits through that indicator will still fire only against closing price (when Moving Average of price is not visible on the chart nor requested by the trader).

Please can this functionality be implemented so that the input of the Moving Average indicator is used in alert notification rather than closing price.