Although it's a temporary answer, I would instead use "identify" for "know who is".
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AnonymousBut my question is the following: Is it possible to start the above sentence with “I would like to know who is the person that ...” in official writing?No. It goes like this: I would like to know who the person is that ...
CalifJimNo. It goes like this: I would like to know who the person is that ...Thank you so much, CalifJim! This was indeed the other alternative I was considering, just forgot to mention it in the original post. I think I will use this approach for most similar situations, which I encounter fairly frequently in my writing.