I don't think you'll find that as an embedded function. There's this plugin, it adds a Latex macro to Confluence, but I'm not sure that will include Confluence Question.
You may also be able to add the LaTex language format to the code macro, available in Confluence Questions. If you have a file describing the language, you should be able to add it in a page like this:
I hope it was helpful.
Jaime Kirch da Silveira
Atlassian Cloud Support
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