Hi Nick
You can configure mail alerts with a custom integration script, and you can modify the custom script to the way you like.
Custom integration
This is an example of how you can configure a mail alert with custom integration in Wazuh.
https://medium.com/@cedrickfoko12/custom-email-alerts-with-wazuh-b5103c6d8f8b
If you need any further help on this, let me know.