You don't need V8 for running JS for scripting, you have quickjs[1] or mquickjs[2] for example. You might have problems importing npm packages, but as we can see from lua plugins you don't even need support for package managers. Performance is not as good as luajit, but it is good enough

[1]: https://bellard.org/quickjs/

[2]: https://github.com/bellard/mquickjs