Ceph » rgw

I read this docs

https://docs.ceph.com/en/latest/radosgw/cloud-sync-module/#cloud-sync-tier-type-configuration

I don't found any documents to config per bucket.

Then i read multisite-sync-policy

https://docs.ceph.com/en/latest/radosgw/multisite-sync-policy/

But i don't found docs for sync policy on cloud-sync-tier-type

How i can config per bucket sync use cloud sync module and multi-site sync policy.

Thanks.