I've been working with students and teachers with Microsoft Translator and using Office Lens to scan in documents to Immersive Reader. After using these products with the students, these are features that would be really helpful:
Using Microsoft Translator, it would be very helpful if, when you take a picture of the document, page, etc., that you could listen to the words on the screen since they are not translated for you, such as Immersive Reader operates.
Using Office Lens to scan documents, etc. in order to integrate with Immersive Reader, it would be very helpful if you could have Translate built into Office Lens so it could translate the document and then read it to you. OR have Translate be directly tied to Immersive Reader.