https://reverb.com/news/how-to-combine-2-daws-with-rewire this article lists the available hosts and slaves. It is a bit old so maybe changes are not noted and I notice melodyne is not listed.
Found the article stating the advantages of using melodyne as a slave via rewire here https://music.tutsplus.com/tutorials/using-rewire-to-expand-your-audio-toolset--audio-1525