Here's my template I made, it's in a Dropbox folder, included is the FF Mark Pro Bold font which is the font used for the Spine text on actual 1st Party Switch games. I have some dummy text already on the spine, just type there what you want instead. It's already in the proper location. Adjust size as needed. Couple things to note:

1. The template was made off of The Binding of Isaac, so the rated M and the Nicalis info on the back is there, but you can easily cover those up with the proper info for whatever game you make.
2. When viewed in Photoshop, the text may not look clear, but trust me, when printed out, it looks great! No blurriness at all.

I'm also including all of the ESRB ratings to use.

Also plan to add some other useful files to folder.

Without further ado, here is the folder: https://www.dropbox.com/sh/do1ecdnf5mfz4ra/AABxbgt84gRqMx9CXtO9aNSQa?dl=0