To do Alt + J I A on Mac in Excel, download and install Accelerator Keys, then press Option, followed by J, I, A.
Command: Add Pen Menu
This is how to do Alt + J I A on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + J I a opens the Add Pen menu in the Draw tab. This menu allows you to add new drawing tools to your Pens gallery, including pens, highlighters, Pencils with custom colors and thicknesses.