The OWNERS file is typically used, sometimes by automated tooling, to answer the "who should I ask to code review these changes?" question.
https://chromium.googlesource.com/chromium/src/+/HEAD/docs/c...
https://docs.github.com/en/free-pro-team@latest/github/creat...
https://docs.gitlab.com/ee/user/project/code_owners.html
It's not meant to be a place for developer bios. If for no other reason than one developer could appear in many OWNERS files scattered throughout a repo, or in multiple repos, and keeping the bio current across all of them would be a nightmare.