app-admin/rsyslog works perfectly on arm64
Next time, you can probably get away with requesting a keywordreq and jut mentioning dependencies that require the keyword as well, rather than filing a separate bug for each dep.
I've keyworded app-admin/rsyslog-8.19.0 which don't require dev-libs/json-c thanks https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=a5156606c4ae236c93694f12f989f5c56e051d06