Minecraft block blender calculator for a ratio?

I'm playing Minecraft and am currently building a medieval stat and I want to make variety for the street with stretchy blocks.

There's my question: Is there a calculator or something that calculates the structure of the circle for you like in "Plotz Model Selection", only for ways like that have to be nicely mixed if you have 8 different blocks.

I thank you in advance.

That works with worldedit. Ex: // replace 20% stone, 50% cobblestone, 30% dirt

Before doing this, of course, mark the desired street with the ax.

Is that also possible without worldedit?

The mod Quark adds a trovel of random blocks placed from inventory