This is not hard (and something we plan). All Markdown components can be mapped to other components, for example, we map blocks to our own . We can let the IdealImage declare mapping from to by wrapping the previous theme's registry. However, the pressing issue is https://github.com/facebook/docusaurus/issues/4530, which means if the ideal image plugin wraps the MDX component registry, other themes can't register more components anymore. We would need to fix that first.