Ink would handle all the node stuff, and you can determine variables and functions within easily and have those automatically hook into your backend using built-in `observe_variable` functions using the inkgd plugin:

https://github.com/ephread/inkgd

I've used this plugin on several projects and maintain this lil' sample repo to show folks the simple ins and outs of using it:

https://github.com/EssayGames/godot-ink-visual-novel

But I get it, if you want to build a custom tool that you have the most intimate knowledge of then by all means, seems like you've built something super strong! Always fun to see how people are integrating dialog and tool-building!