How to "groupBy" PRs that don't have the labels at the end?

I don't want to specify every label, and some PRs don't need to have labels but should still be included in the release.

There doesn't seem to be a way to do that currently.

No file or test is named in the issue. Start by locating the release-note grouping and groupBy configuration entry points, then trace how unlabeled pull requests are currently handled. Done means a user can omit an exhaustive label list while still including pull requests without labels, with documented behavior and coverage for both labeled and unlabeled cases.

Written by the indexing model from the issue text.