I am using otto[0] (similar to goja) in the headless cms I maintain [1] in "actions" api [2]. So one can customize actions according to needs by writing JS. The JS is executed inside a transaction. Sort of a mini-lambda kind of api

[0] https://github.com/robertkrimen/otto [1] https://github.com/daptin/daptin [2] https://daptin.github.io/docs/actions/actions/