var google.golang.org/grpc/internal/envconfig.XDSORCAToLRSPropEnabled

one use

	google.golang.org/grpc/internal/envconfig (current package)
		xds.go#L91: 	XDSORCAToLRSPropEnabled = boolFromEnv("GRPC_EXPERIMENTAL_XDS_ORCA_LRS_PROPAGATION", false)