Is there a way to create static / multi-dimensional arrays?

I have a set of about 30+ KPIs .. each has it's own "formula".    Rather than creating so may formulas.. I thought about putting the logic behind a button.  It worked fine until I hit a wall.. The code simply stopped adding rows to my composite table.  So I added another button and it kept working..    So rather than creating so many objects... I figured I could create a series of multi dimensional arrays.. One to hold the KPI text.. and another the KPI values.. each KPI has three values ..  However, definition like

let kpiDesArray := [ ["1.1", "First KPI"], ["1.2", "Second KPI"], ["2.1", "Third KPI"]];

does not work.