How to install the optional opentelemetry.trace library?

[nojaf]

Hello @c-cube,

I've played around with https://github.com/c-cube/ocaml-trace yesterday and it works very well.
I would like to store my traces in Jaeger and I'm wondering what I need to install.
It doesn't seem to be present on Opam, so I'm not quite sure what to install.
Any pointers?