'r?' without auto-assignment

[RalfJung]

In Miri I'd like to use r? but we don't currently want automatic assignment of PR reviewers. However, according to the docs:

If the owners map is configured, then triagebot will automatically select a reviewer based on which files were modified in the PR. This also enables the ability for users to post a comment with r? name to set the assignment to a specific user.

Is there a way to enable r? comments without having an owners map?

[ehuss]

Not really. You can use @rustbot assign @user if you are a team member.

[RalfJung]

I guess that works, though r? is so much shorter, would be nice to also be able to use that.