Is there a way to convert Wii U worlds to Java without Windows?

I have some old worlds on Wii U edition that i'd like to be able to play again in more modern game versions. Is there a way to convert these to Java edition worlds without using any Windows-specific programs, since i use Linux (Debian)?

I already have Aroma set up on the console, and i'm trying to get the worlds with Saviine now.