CODEOWNERS with read only access

[phlax]

We have a repo (https://github.com/envoyproxy/envoy) where there are quite a few CODEOWNERS and most do not have write permissions

We kinda want it that way because we want to record who is responsible for specific parts of the repo, even/especially where they are not maintainers and dont have write access to the repo.

This both allows us to remember who is responsible and pings them in the event a PR is raised to change relevant code.

Not sure if its always been this way - but certainly now we are getting errors about the CODEOWNERS file not being valid

Surely there is a pretty valid use case for readonly CODEOWNERS - would this be possible ?