@Mariya Miteva Azure Language service has both these offerings i.e sentiment analysis and opinion mining. If I understand your question correctly, you are looking to use the APIs by passing text in a language other than English and then obtain the result in English.
I think this is currently not possible with the API, you can train a model with one language and classify it in a different language without needing to create another project for sentiment analysis but getting the output in different language is not possible.
As a workaround, you will have to include the translate API to process the sentiment analysis and opinion mining result and translate it to the required language. Hope this helps!!
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