Custom labels for inbuild starlette-prometheus metrics

[AshutoshSinghai-InvizAI-DataEngg]

I want a way to inject custom labels like app_id/tenant_id for a SaaS application
So that it is easier to visualize no. of requests and other metrics for specific tenant.

Note: I can do this by creating a custom metric, but just wondering if there's a way to add custom label (tenant_id), and tell starlette-prometheus to pick it from the route handlers or if we could use it as a dependency or something