There isn't any example for that specific use-case. You can use https://github.com/authzed/examples/tree/main/datastores for inspiration. Essentially you'll need to set

SPICEDB_DATASTORE_BOOTSTRAP_FILES

to a path in the container, and then mount your file into that path. You can see an example of mounting a file into the container here https://github.com/authzed/examples/blob/main/tracing/docker-compose.yaml#L27-L28