I'm writing markdown on vscode. But some math latex commands are not supported on vscode built-in preview. E.g.
$$ \ket{\psi} $$
cannot be properly rendered. How do I fix this? How do I add support to a bigger set of commands? Are there any extension that does this for me?
I installed markdown + math extension, but still not working for \ket command. Also for some reason, markdown + math's official example for equation numbers supporting is not working. I don't understand why.

