register: pooldata

  - name: print some debug
    debug:
      msg: "{{ pooldata.pool./dmz-80/access-stage.active_member_count }}"

{"msg": "template error while templating string: expected name or number. String: {{ pooldata.pool./dmz-80/access-stage.active_member_count }}"}

JSON BLOB:
----------
{
   "ansible_facts":{
      "pool":{
         "/dmz-80/access-stage":{
            "action_on_service_down":"SERVICE_DOWN_ACTION_NONE",
            "active_member_count":2,
...
...