How to check if a cell has a single quote in the beginning?

Question

In Excel, in a cell we could add a single quote before a formula (e.g., '=3+4), to let the formula not evaluate. And in the formula bar, we could see the single quote.

Is there a JavaScript API to check if a cell has such a single quote?

We tried formulasLocal and values, but they all returned the formulas and formulas without the single quote.