Exponent numbers in NewText()

I’m currently having troubles trying to display mathematical operations with newText(), and my main problem concerns the exponent numbers.

I’m using Unicode char : x⁰ x¹ x² x³ x⁴ x⁵ x⁶ x⁷ etc…

But as you may see or already know, the 1/2/3 exponent characters (being historically older) are different from the other exponents. Other char than those 1/2/3 are also missing in a lot of font too…

So I was wondering if Corona had solutions for that kind of problem ? It would be really complicated to make different NewText, each with a custom scale, for each character (5 elements just to display x¹ + x² does look excessive to me), and was hoping Corona had an equivalent to the Html <sup> by example ?