Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
When you enable Private Link to your origin in Azure Front Door Premium, Front Door creates a private endpoint on your behalf from an Azure Front Door managed regional private network.
When you say, "manual configuration of an AFD Origin"
- I take it that you have an existing Private EndPoint for this PaaS Service VNET
- This would be customer managed VNET
- And you would like to know if we can use such Private EndPoints as the Origin
I doubt this would be in the roadmap.
Nevertheless, I shall check this internally and get back to you shortly
Cheers,
Kapil