URP ~ I want to create a dissolve shader that works with a mask of sorts

Heya,

So the title says most of it, I am looking to create a dissolve shader in shader graph that then works with a mask like in the asset pack "Advanced Dissolve" by Davit Naskidashvili

I am looking to do something similar in URP but want to make it myself but a bit lost as to where to even begin if somone might be able to point me in the right direction?

Thanks a bunch