Save F-stat from first stage to table

[giovanni moneta]

Hi all,
I have to perform some regressions like

quietly ivregress 2sls dep (indep=instrument) i.controls, cluster(clustervar)
estat first
*
quietly ivregress 2sls dep (indep=instrument) i.controls control2 d.control3 d.control4, cluster(clustervar)
estat first

and I would like to save and print in a TeX table with outreg2 the F-stat and robust R² from the first stage regression.

How can I do it? I am not able to figure out how to extrapolate these two results.

Thank you