Most formula-to-speech software only works with <A HREF="https://www.chhs.colostate.edu/accessibility/best-practices-how-tos/mathml/">MathML,</A> so you would first need to convert the LaTeX you find on arXiv.

There may be an alternative, under development for <A HREF="http://taichenrose.me/tex2speech.html">AWS</A>:    
***Tex2Speech*** takes LaTeX documents and converts them into spoken audio.

Here is the <A HREF="https://tex2speech-website.vercel.app">documentation,</A> and this is how <A HREF="https://youtu.be/9_Mlz7RPFic?t=39">it sounds</A> when confronted with a simple equation.  

It looks promising, but I read that you need an account with AWS, which may well complicate things.