[ceph-users] Compression on existing RGW buckets

I'm wondering if it's possible to enable compression on existing RGW buckets? The cluster is running Luminous 12.2.12 with FileStore as the backend (no BlueStore compression then). We have a cluster that recently started to rapidly fill up with compressible content (qcow2 images) and I would like to enable compression for new uploads to slow the growth. The documentation seems to imply that changing zone placement rules can only be done at creation time. Is there something I'm missing that would allow me to enable compression on a per-bucket or even a per-user basis after a cluster has been used for quite a while? Thanks, Bryan