GitHub - JuliaPackaging/BinaryBuilder.jl: Binary Dependency Builder for Julia supports Go so it should be relatively straight forward to make a jll of GitHub - hjson/hjson-go: Hjson for Go.
An example of a go app on Yggdrasil is Yggdrasil/G/goaws/build_tarballs.jl at 5c85d729b0f178277359ace7f9091c8677fbf777 · JuliaPackaging/Yggdrasil · GitHub