Math in initialText?

I’m trying to have formatted math appear in initialText in an input box. Here’s my code:

initialText: "Generally the derivative of \\f\left(x\right)=a^x is …
except when a="

I’ve tried with the initial back slashes and without. And yet, I only ever see:

Is math formatting not supported in initialText?

It is not, sorry. Initial text will support math formatting when it becomes supported for students to enter math text.