I am affraid that Chamfer is not implemented!
You must simulate it! (Boolean Diff for example)
or maybe this (no time to test now :( (working without node! So I am confident ;)

Edit : Tested! Seems that is working only on a Volume, not only on edge(s) or surface(s)!
Better than nothing! :)



For the random : https://moiscript.weebly.com/basic.html#biberandom