zabbix-plugins/plugins/client/web-discovery/conf/web-discovery.conf

UserParameter=web.availability.discovery,/etc/zabbix/scripts/yaml2json /etc/zabbix/zabbix_plugins.conf.d/web-availability-discovery.yml
UserParameter=web.metrics.discovery,/etc/zabbix/scripts/yaml2json /etc/zabbix/zabbix_plugins.conf.d/web-metrics-discovery.yml