Loki retention overrides in helm not working

Grafana Loki
8

Used latest version (as of now), loki helm 6.30 and worked with below way.

    runtimeConfig:    
        overrides:
            tenant_1:
                retention_stream:
                  - KEY: VALUE
                  - KEY: VALUE
            tenant_2:
                retention_stream:
                  - KEY: VALUE