How to add R-squared in -esttab- regression?

Code:

 
 sysuse auto, clear    
 eststo: regress price weight mpg    
 eststo: regress price weight mpg foreign    
 esttab using example.tex, label nostar title(Regression table\label{tab1})

What I want is that: I have additional Observations and R-squared in the 1st column (i.e., add R-squared, and let observation show up along other variable, rather than on the bottom line). I also want to add one row called Specification, and both are OLS. How to do these by using -esttab-?

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