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I found this issue

Yes - this is a (really the only) current limitation for multi-language components. We don't have a mechanism today to call the transformation function in your source language from the component-implementation language (across different processes). The primary workaround for some cases of this is to implement a transformation inside the component, which will apply to all the component children, and perhaps pass an input to the multi-langauge component to decide when to apply this transformation and how to parameterize it. This certainly doesn't cover all cases of transformations, but it has been enough to unblock some users who have hit the need for this. We certainly want to add this support in the near future, though it depends on some new machinery being added to support cross-language callbacks.

Got it. Thanks for the clarification!