The Regression analysis doesn’t produce as output the coefficients from the models. They are only available in the "Regression report".
Therefore, you will need to calculate them separately.
You can achieve this using the Formula language after the Regression analysis. Use one of the following formulas:
Slope(series1, series2) Slope(series1, series2, window)
These formulas return the coefficient of the regression, a.k.a. the beta, between series 1 and series 2 where series 1 is set as the dependent series.
The second formula has a “Window” variable, allowing you to calculate a rolling regression coefficient (or rolling Beta).