It already can, as it currently just transpiles to C++ it just needs clang to build [1].

Even though it doesn't require SerenityOS, even SerenityOS GUI apps can be ported to run on Linux, Andreas already has ported its Ladybird Browser that wraps SerenityOS LibWeb engine in a QT App [2] to Linux, his last video shows "Abstracting the event loop so Ladybird can be fast & responsive on Linux" [3]

[1] https://github.com/SerenityOS/jakt#usage

[2] https://github.com/SerenityOS/ladybird

[3] https://youtu.be/S8lXroxngYo

They're making it as a transpiler to their dialect of C++. On other OS it can also work because they have the Serenity Browser engine running on Linux. So probably take some parts of the build chain there and off you go.