How to include generated files in the release-please commit

I would like to update the generated documentation which is published via github pages along with every release-please commit.
Checking the customization documentation I only see how to replace version strings, however, it would be nice to not only bump the version in `package.json` etc. but also run a script (i.e. build the docs) and then add those generated files with the version bump commit from release please.

Is this possible?