I have a json variable which looks like this:

```
{
  "status": "closed",
  "host": "host1-availabe_zone_A"
}
{
  "status": "closed",
  "host": "host2-availabe_zone_B"
}
{
  "status": "closed",
  "host": "host3-availabe_zone_A"
}

```

I am trying to convert it to a hash-like data structure (associate array in zsh/bash) to get number of hosts in each availabe zone. The preferred result will be this based on the data above:

```
availabe_zone_A -> 2
availabe_zone_B -> 1

```

I got some problem when trying to iterate the json variable. 

```
declare -A az_to_number_of_open_hosts
for host in $(jq . <<<  $hosts_list)
do
  az=$(rev <<< $(echo $host | jq .host) | cut -d. -f3 | rev)
  ((az_to_number_of_open_hosts[$az]++))
done

```

The line to extract available zone is because the host format is always `blabla123213.az.domain.com`.
The code does not work since it seems the variable `host` refers to each line of json string rather than a json entry. Is there a recommended way to iterate each json entry?