from spicedb's side it just supports xds discovery, you can pass it config with

GRPC_XDS_BOOTSTRAP

(see https://github.com/grpc/grpc-go/blob/master/examples/features/xds/README.md#the-client and https://github.com/grpc/proposal/blob/master/A27-xds-global-load-balancing.md#xdsclient-and-bootstrap-file) there still needs to be something serving the xds api somewhere. AWS appmesh says it does this for ECS, but I don't have any personal experience with it.