isMCP := strings.HasSuffix(opts.Xds, ".googleapis.com") || strings.HasSuffix(opts.Xds, ".googleapis.com:443")
	if isMCP {
		// Special credentials handling when using ASM Managed Control Plane.
		mem, err := getHubMembership(ctx, kubeClient)
		if err != nil {
			return nil, fmt.Errorf("failed to query Hub membership: %w", err)
		}
		aud = []string{mem.WorkloadIdentityPool}
	}

			}
			dst[k] = v
		} else {
			dst[dstHdr] = v
		}
	}
	return nil
}

type hubMembership struct {
	WorkloadIdentityPool string
}

func getHubMembership(ctx context.Context, exClient kube.CLIClient) (*hubMembership, error) {
	client := exClient.Dynamic()
	gvr := schema.GroupVersionResource{
		Group:    "hub.gke.io",
		Version:  "v1",
		Resource: "memberships",
	}