Importing reviews only

Over the years, I've built my library catalogue both on Goodreads and LibraryThing, but usually I've reviewed books only on Goodreads. Now I would like to import my reviews here also.

Is there a way to make an import for only that field here, leaving all my other LT data unchanged, or do I have to manually copy every review of mine in GR and paste it into the corresponding book in my LT library?

Thanks

Manual copy.
You probably will want to edit each review to remove GR references and code and replace it with the appropriate LT code.
But just having a tab for GR and a Tab for LT open should make it a little easier