GCP Internal HTTPS load balancer

I am trying to create a GCP Https load balancer with terraform resources. The google recently got this beta version of internal load balancer (http/https).
But I couldn’t find anything related to this, all I got are either TCP Internal or HTTPS External.

In terraform there is Google_compute_region_backend_service which is only used for TCP protocols and there is Google_compute_backend_service used for HTTPS Global external load balancing.

The google says there is Internal HTTPS load balancing concept that can create internal load balancer with https protocol.
Could someone guide me here please?