如何在核心图条形图中添加椭圆

The image with the ellipse on the bar graph is the desired result. I inherited code that creates a bar graph that displays a persons blood pressure. I have been tasked with plotting a ellipse on top of the bar graph to display the person heart rate. So I"m using the same x-axis but I believe I need to add a another Y-Axis. Here's the code. I added second plotspace (plotspace2) and another y-axis (rightY). Any assistance would be appreciatedThe image with the ellipse on the bar graph is