Return 400 errors from each service task synchronously to web/rest client

I have front end application calling spring rest endpoint which in turn use the camunda engine where it synchrounsly call multiple microservices and if i get 400/4xx validation error from either of these microservices i need to respond to the web client calling the rest endpoint with the relavant error message so that web client can correct the input and send it again.
What is the best approach. Please refer me if any examples already there.

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