not sure if there is still a automation available, but I can not find any way to automate chisseling :(

I was able to create a script to add StoneCutter recipes for all Chisel Blocks (KubeJS required)
/kubejs/server_scripts/chisel_to_stonecutter.js
chisel_to_stonecutter.js

This DataPack file adds a tag to every Chisel Block to be used by the script:
/kubejs/data/chisel/tags/items/chiseled_blocks.json
chiseled_blocks.json

if you are using the Factory Blocks Addon, you can use this file:
/kubejs/data/factory_blocks/tags/items/chiseled_blocks.json
chiseled_blocks.json

(remove the .txt extension from the downloaded files)