I'm sorry, but the provided extracts do not contain specific information on how to connect to the cloud-hosted Ory Keto via gRPC. However, they do mention that Ory Keto exposes two APIs for integration, one of which is gRPC. For more detailed instructions, you may want to refer to the Ory Keto [gRPC API documentation](
http://ory.sh/docs/keto/reference/proto-api) mentioned in the extracts.