Yes but "reduce" just a part of numerous Nodes can be helpful in case of a big circuit ! :)
(when this part is good working)

Maybe this function is yet existing!
I must explore the doc : https://github.com/jagenjo/litegraph.js

In fact i have never used intensively such prog
but i see that is increasing very speedy as soon as you want make something biggest that a simple 3 nodes! :)