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Read the original raw-return fit
The supplied raw asset and benchmark returns give slope 2.1 and intercept 1.2% per period. That intercept describes the fitted asset return when the chosen benchmark return is zero; it is not by itself a skill or Jensen-alpha conclusion.
Apply an explicitly constant risk-free return
If the same risk-free return f is subtracted from both series in every period, the centered cross-products stay unchanged and slope stays the same. The excess-return intercept becomes a+(b−1)f.
Use the original 0.1% assumption
At f=0.1% per period, the excess intercept is 1.2%+(2.1−1)×0.1%=1.31%. This is an original transformation check, not a current risk-free rate or a measured manager appraisal.
Retain model and estimator requirements
CAPM-relative alpha interpretation needs the appropriate excess-return model and benchmark context. If risk-free returns vary across periods, subtract each matched value and refit; the raw slope need not remain unchanged. The public tool does not infer or fetch a risk-free series.