Dose marked not support math?

[13554599576]

example I use

$$
$ J_\alpha(x) = \sum_{m=0}^\infty \frac{(-1)^m}{m! \Gamma (m + \alpha + 1)} {\left({ \frac{x}{2} }\right)}^{2m + \alpha} \text {，行内公式示例} $
$$

But it don't work

[UziTech]

No it does not, but you can extend marked to support it #1538 (comment)