Set device-class via service specification file

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Hi,
We are setting up a test cluster with cephadm. We would like to
set different device classes for the osd's . Is there a possibility to set
this via the service specification yaml file. This is the configuration for
the osd service:
....
---
service_type: osd
service_id: osd_mon_disk_layout_fast
placement:
  hosts:
    - fsn1-ceph-01
    - fsn1-ceph-02
    - fsn1-ceph-03
spec:
  data_devices:
    paths:
      - /dev/vdb
  encrypted: true
  journal_devices:
    paths:
      - /dev/vdc
  db_devices:
    paths:
      - /dev/vdc

We would use this than in the crush rule. Or is there another way to set
this up?
Thanks
Best
Robert
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