To do Alt + J I A H on Mac in Excel, download and install Accelerator Keys, then press Option, followed by J, I, A, H.
Command: Add Highlighter
This is how to do Alt + J I A H 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 h adds a new highlighter to your Pens gallery. Highlighters draw semi-transparent strokes that allow underlying content to show through, perfect for emphasizing important data or marking up your spreadsheet for review.