The go-chroma package only contains a COPYING file as show by running

$ tree $(guix build go-chroma)
/gnu/store/khpaajvfqgx46llffwz2416w7fqqy2sf-go-chroma-2.14.0
└── share
    └── doc
        └── go-chroma-2.14.0
            └── COPYING

I tried fixing it, but did not get it compile properly. Maybe someone
with more than 0 knowledge of go packaging could get better results.