Bash script that creates JSON document for Zabbix discovery

zbx_domain_list.sh

#!/bin/bash
VHOST_CONFIG_PATH='/etc/nginx/sites-enabled/'
echo "{"
echo '    "data":['
FIRST=1
 
while read line; do
    if [ $FIRST != 0 ]; then
        FIRST=0
    else
        ELEMENT="{ \"{#DOMAIN}\":\"$DOMAIN\" },"
        echo "        $ELEMENT"
    fi
    DOMAIN=$line
done <<< "$(find $VHOST_CONFIG_PATH -type f | awk -F '/' '{print $5}')"
ELEMENT="{ \"{#DOMAIN}\":\"$DOMAIN\" }"
echo "        $ELEMENT"
echo '    ]'
echo "}"