You can use software like LIghtBurn to generate the test grids for you.
I’ve also seen people selling grids on stores like Etsy, so I imagine there are downloads available for free if you dig into it. I think this has limited value because generally you want to make your own grids, where you start with your own range then maybe make a new one with finer grained divisions once you have the broad range defined. I actually keep the successful grids of different materials with the machine I use in case my material libraries ever get corrupted.
For what it’s worth we were just discussing LightBurn with a 1F and Tech laser the other day in this post: Cutting Technique Suggestions? There is some valuable information there regarding exporting to the 1F from LightBurn and configuration if you decide to investigate that route.