A nice feature to be added to the code blocks would be the ability to specify the coding language being used and for it to then format/highlight the code accordingly.
This functionality exists in other products, such as Azure Devops Wikis, to see an example of what i mean view this link -
https://learn.microsoft.com/en-us/azure/devops/project/wiki/markdown-guidance?view=azure-devops#code-highlighting