It's definitely possible but the Scratch Blocks [1] wiki [2] is indeed a little sparse. VEXcode Blocks [3] seem to be a successful product, so somebody must have figured it out.

[1] https://github.com/llk

[2] https://github.com/LLK/scratch-blocks/wiki

[3] https://www.vexrobotics.com/vexcode-blocks