There has been developed such a plugin a while ago... but I'm not sure if it is compatible anymore: https://www.question2answer.org/qa/37512
Anyway, I guess that what you actually need is just a CKEditor plugin that would allow you to highlight the code. There are many but it seems the official one would be this one and there is a tutorial here. The only Q2A-related thing that you should bare in mind is that you will have to enable the CKEditor plugin in the WYSIWYG editor. Here is a tutorial on how to do that.
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