Well, it will be still a bit of manual work, but if you can export metadata from forscore as csv then you probably can use that (after adjusting the format and columns a bit) with MS' batch import feature which also uses csv to import metadata (or rather the songs creating the entries in MS including metadata). Doesn't work for annotations like markings etc. though (and I can't imagine a way possible ).
But if you have the metadata as csv you are already half (or 75 % or more) there. Just familiarize yourself a bit with the csv import. There are quite a lot useful posts about it in the forum.
But if you have the metadata as csv you are already half (or 75 % or more) there. Just familiarize yourself a bit with the csv import. There are quite a lot useful posts about it in the forum.