Add a new repository to an existing Runner Group using code or the CLI?

We are currently using a combination of the GitHub REST API and GitHub CLI to create workflows that create a set of repositories for a new named entity. One thing that we would like to do is add one of the new repositories to an existing GitHub Runner Group that we have configured in our organization.

Is there a REST API entry point or GitHub CLI command that will allow us to do add a repo to an existing Runner Group? I’ve read through the documentation for each and have not found anything.