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https://github.com/xoofx/markdig/blob/203cfd6508d4f8fca510edd2f66f229ada2c25ad/src/Markdig/Extensions/Bootstrap/BootstrapExtension.cs maybe you can create an extension like this?
It does not look like there is a way to do it in markdig. However you could use something like https://github.com/zzzprojects/html-agility-pack/ to add it after the fact.