I would like to add significance annotations with asterisks between the two bars in each facet of the plot produced by the dataset and the code in the following gist (just copy and paste and you have all you need).

https://gist.github.com/drfalco/b2d501fecc78faacfce23fe19f1ab639

I have tried in vain to reach the desired result using the ‘ggpubr’ and ‘rstatix’ libraries. Could you please help me out?