There are several variants of making this simple and useful jig, that you can make in a short time from the waste parts of the boards or plywood. This is my variant of jig that can be easily adapted to your needs with the accompanying instructions and video on how to make it.
https://youtu.be/2R-d34r26rA
If you’re interested in making this jig, please subscribe to my channel https://www.youtube.com/c/WoodenWorldDenic and download free plan