Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you would like to limit the public exposure to your EventHub using Azure Front Door with Private EndPoint.
Currently, direct private endpoint connectivity is limited to:
- Storage (Azure Blobs)
- App Services
- Internal load balancers, or any services that expose internal load balancers such as Azure Kubernetes Service, Azure Container Apps or Azure Red Hat OpenShift
- Storage Static Website
Refer : Private Link in AFD Limitations
So, I am afraid this won't be feasible.
Please let us know should you require additional information
Cheers,
Kapil