How to Add Shapes to Cells Within Matrix

Hello,

I am quite new to PowerBI and have spent quite a bit of time training and reading through forums for assistance with specific issues I have been having. 

One thing I have been having problems with recently is adding shapes (up and down arrows) to empty cells within my matrix to reflect performance regarding measures within the rows. I recognize that I can select shapes and move them around freely, but this will not work considering I have rows set to a drop-down manner. 

How can I go about handling this?