See if this is similar & read the introduction. If they don't call for nuts, it's no problem adding them to most cookie recipes.

Here is a link that might be useful: Bishops Raisin Cookies

Here's another that does have walnuts but it's filled. It doesn't mention soaking the raisins in rum or brandy but you could use that instead of water. It was made by the poster's German grandmother.

Here is a link that might be useful: Cookies