How to add secondary Y-axis in RStudio?

Everyone, I know this is not R discussion group but since many people here use RStudio for data plotting and visualization in conjunction with NONMEM, I thought I might get help here. Anyone knows how to add secondary Y-axis with its own "independent" scaling? Reason I said independent is because right now I can add secondary Y-axis in ggplot but its scaling is dependent as a factor of primary Y-axis and I don't want that. I am also using GraphPad which helps in independent scaling of secondary Y-axis but the process is too long. So, any options and help will be appreciated. Thank you! Regards, Sumeet Singla Graduate Student Dpt. of Pharmaceutics & Translational Therapeutics College of Pharmacy- University of Iowa