Adding statistic values to the X-Y plot

I was looking for the best way to add statistic values to the plot, and I found a way in this post  "Adding p values and R squared values to a plot using expression() ". It was really helpfull.
Just to check it I add the RSQ and Slope statistics, but the idea is to add more, so lloking to the plot you can have an idea about how the model performs.