It sounds like you are saying that your Monitoring dashboards are missing the info for your Beats. Or in other words, you are trying to set up Beats Monitoring, as in https://www.elastic.co/guide/en/kibana/current/beats-page.html
Take a look at the guide to configure Beats for Monitoring: https://www.elastic.co/guide/en/beats/filebeat/current/monitoring.html. If Elasticsearch is the output for your Beats, adding xpack.monitoring.enabled: true to the YML might be all you need to do.