No codecov.io support? No problem. Use {covr} to generate the stats and generate your own badge dynamically.
You can also show users more specific coverage stats as well.
https://codeberg.org/adamhsparks/epicrop/src/commit/d5a54f5f1d4d2208a3c8353db7cf468971d6c3fe/README.Rmd#L103
It looks like this when rendered: https://codeberg.org/adamhsparks/epicrop/src/branch/main/README.md