Changing default font for \mathcal in “Pages” equations

I recently asked a [question](https://tex.stackexchange.com/questions/576754/changing-default-font-for-mathcal-in-pages-equations-mac?noredirect=1#comment1452117_576754) on TEX StackExchange but thought it would be more appropriate to ask it here. I am using Pages version 10.3.5 (7029.5.5). Typing in TeX environments in Farsi is an absolute pain even though the output is fine so I was writing in Pages. My problem is, I want to type this "F" in an equation: But \mathcal{} gives me fancy RSFS characters like this: The default font for mathcal is the Computer Modern one everywhere else. Though I read in jksoegaard's answer in this [question](https://apple.stackexchange.com/questions/378657/does-pages-support-latex-extensions) that Pages doesn't support installing LaTeX packages, I wanna know if I can manage to get the font I want.