Hi Kirijan,
It is not possible to show zero if you are adding fields in table visualization. I will suggest using different visualization one with a data table and one with a Gauge and add them in the same Dashabord. Check the screenshots for reference.
Check this document to learn more about the Dashabord creation:
https://documentation.wazuh.com/current/user-manual/wazuh-dashboard/creating-custom-dashboards.html
I hope you find this information helpful.