Create a Custom Indicator

I would like an Indicator like the one I used on Tradingview it is the LSMA - least square moving average. This is also known as an End Point Moving Average EPMA.  This moving average uses Linear Regression.  If it needs to be done in Python or R and ported in that is fine.  Also, there should be an OFFSET value to adjust the moving averages as well as a dialogue box to change the values of the time frame, moving averages and offset. The Indicator is a Moving Average Cross of the 2 LSMA. When the short moving average crosses above the long moving average it is a buy signal, when the short crosses below the long it is a sell signal.