calling sp_invoke_external_rest_endpoint for a private endpoint

[PaulEdwardsAP]

Not sure if this is available and not documented, or an unsupported configuration, but I'd like to be able to use sp_invoke_external_rest_endpoint against a private endpoint rather than the public endpoint for my Azure openai service.

With public endpoints disabled, and a private endpoint available, a sql server in the same vnet hits the services public endpoint and there doesn't seem to be any well documented mechanism to specify outbound routing - all network config options relate to inbound

Is there any way to achieve this?