For the curious, Fennel[1] is to Lua what Clojure is to Java. I'm curious, though, can you not add Lua libraries to redbean? My understanding is that the file is a zip and you can therefore add dependencies and (presumably) load them into the lua runtime on invocation. E.g. you don't need Justine to add it for you, you can add it yourself.

1 - https://fennel-lang.org/