I've started working on a statefulset based Helm chart for spicedb. You can find it here:
https://github.com/jonwhitty/helm-charts/tree/master/charts/spicedb
The goal is to make it more fully featured. Right now it just supports an absolutely minimum viable Helm chart to install a multi-node spicedb cluster. It's been used by our team already to manage a multi-node spicedb cluster with dispatching.
More work is coming to wire up the TLS settings and everything, but hopefully it helps some of ya'll out there in the community already 👍
Feel free to contribute as well :).