ceph-ansible not using overrides of cephfs_pools (cephfs_data and cephfs_metadata) via CephAnsibleExtraConfig THT parameter

Issue

One of our customers wants to enable autoscaling of PGs for all pools by setting [1] for each pool using TripleO. Customer achieved what he wanted for every pool but cephfs_data and cephfs_metadata by tuning ceph_pools definition. But the situation is different for cephfs_data and cephfs_metadata pools: at first ceph-ansible sets settings [1], but then reverts them.

From upstream ceph-ansible issue 2239 it looks like ceph-ansible allows to define a subset of cephfs_pools settings. At this point we are looking for advice about THT variable that should be used to do this: we tried CephAnsibleExtraConfig [2], but it didn't work as expected and complained "The task includes an option with an undefined variable. The error was: 'cephfs_data' is undefined" [3].

[1]

    pg_autoscale_mode: 'True'
    target_size_ratio: '0.0'

[2]

CephAnsibleExtraConfig:
  cephfs_pools:
          - name: "{{ cephfs_data }}"
            pg_autoscale_mode: 'True'
            target_size_ratio: '0.0'
          - name: "{{ cephfs_metadata }}"
            pg_autoscale_mode: 'True'
            target_size_ratio: '0.0'

[3]

2023-06-30 15:47:36,580 p=852187 u=root n=ansible | TASK [ceph-mds : create filesystem pools] **************************************
2023-06-30 15:47:36,580 p=852187 u=root n=ansible | Friday 30 June 2023  15:47:36 +0800 (0:00:00.056)       0:08:10.266 *********** 
2023-06-30 15:47:36,604 p=852187 u=root n=ansible | fatal: [HOSTNAME -> {{ groups[mon_group_name][0] }}]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'ansible.utils.unsafe_proxy.AnsibleUnsafeText object' has no attribute 'name'\n\nThe error appears to be in '/usr/share/ceph-ansible/roles/ceph-mds/tasks/create_mds_filesystems.yml': line 25, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n    - name: create filesystem pools\n      ^ here\n"}