The standard argument is: dose opening a CC-BY-SA document in a word processor effect the word processor's license? Even if you distributed the documents as a template inside the word processor's installer I don't think you could claim the word processor was a derivative work. The intent of the SA license is that if you also improve the the template you have to share the improvements.

Having said that at least the Switch version will contain technological measures (from Nintendo) to prevent the sharing and adaption of the games assets. So even if the license is not at all viral it may not grant them permission to include the covered artwork.

I don't know that it does have similar expectations for licensing your game under the same terms. This is ultimately for courts to decide. It's incredibly ambiguous if a game is a derivative work or a collection; The latter avoids virality.