`add.lines` parameter not working in `stargazer` for data frame?

Question

I have stored the output of a regression in a dataframe like so:

> df
                   beta        se    p
air_quality  -0.0535707 0.5251661 0.92

I know that I can export the regression results using stargazer and the regression object, and the use the add.lines parameter to write my own goodness-of-fit statistics. For example:

stargazer(model1,
          add.lines = list(c("No. of Observations", "388"),
                           c("No. of Males", "43")))

or using custom.gof.rows in texreg:

texreg(model1, 
       custom.gof.rows = list(c("No. of Observations", "388"),
                           c("No. of Males", "43")))

The problem is that neither does add.lines in stargazer work or custom.gof.rows in texreg because it does not allow dataframes.

I'd like to know if this is possible using a dataframe like I do.