Why repoName does not appear in buildinfo json?

[nixilin]

I deployed an maven artifact and corresponding docker image to Artifactory through a standard pipeline, and I can fetch the build by using API:
https://<domain_name>/artifactory/api/build/<build_name>/<build_number>
But I can not find that repo which contains docker image (except .buildInfo.modules[0].properties."docker.image.tag").
So I do not understand: repoName is not a part of buildinfo ?
Who can explain for me ?
Thank you.