Hi all,
I searched for a way to help contact tracing on my Librem 5 too. Doing so I found that Alyssa Rosenzweig has implemented experimental exposure notifications implementation for GNU/Linux.
You can find the code here https://gitlab.freedesktop.org/alyssa/liben
You will also find a reference to the Librem 5 in this interesting blog post: https://rosenzweig.io/blog/fun-and-games-with-exposure-notifications.html