Is there a way to have a javascript function for format in math blocks?

[hanoii]

I don't know or think this is possible, but thought of asking.

I wanted to format the numbers with some locale as they are currently currency and it's easier to follow.

I managed to do it with:

format(x) = x.toLocaleString('es-ar');

However, I am not super sure about to extent of javascript I could do with format. I tried complex functions, anonymous functions, arrows functions ,but none worked. It this this work only because it ends up being a valid math block function, but can I use a more complex format callback some how in the max block?