Istio local rate limiter using Envoy filter for a specific request path and source labels

Question

In a Service Mesh controlled by Istio, I would like to throttle the inbound traffic based on two conditions below:

• Request path
• Source Label (e.g., app: an-app)

Every document guided me to use descriptors but I cannot use it because the request does not contains proper header information for POST API such as :path or else.

Here is the configuration for current Envoy filter and it works fine for throttle all inbound traffics via 80 port but what I really want to do is using different bucket conditions for each API path and source labels.

Is there any reference for throttle the requests based on these criteria?

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: filter-my-api-local-ratelimit-svc
  namespace: myns
spec:
  workloadSelector:
    labels:
      app: my-api
  configPatches:
    - applyTo: HTTP_FILTER
      match:
        context: SIDECAR_INBOUND
        listener:
          filterChain:
            filter:
              name: "envoy.filters.network.http_connection_manager"
      patch:
        operation: INSERT_BEFORE
        value:
          name: envoy.filters.http.local_ratelimit
          typed_config:
            "@type": type.googleapis.com/udpa.type.v1.TypedStruct
            type_url: type.googleapis.com/envoy.extensions.filters.http.local_ratelimit.v3.LocalRateLimit
            value:
              stat_prefix: http_local_rate_limiter
    - applyTo: HTTP_ROUTE
      match:
        context: SIDECAR_INBOUND
        routeConfiguration:
          vhost:
            name: "inbound|http|80"
            route:
              action: ANY
      patch:
        operation: MERGE
        value:
          typed_per_filter_config:
            envoy.filters.http.local_ratelimit:
              "@type": type.googleapis.com/udpa.type.v1.TypedStruct
              type_url: type.googleapis.com/envoy.extensions.filters.http.local_ratelimit.v3.LocalRateLimit
              value:
                stat_prefix: http_local_rate_limiter
                token_bucket:
                  max_tokens: 3
                  tokens_per_fill: 3
                  fill_interval: 60s
                filter_enabled:
                  runtime_key: local_rate_limit_enabled
                  default_value:
                    numerator: 100
                    denominator: HUNDRED
                filter_enforced:
                  runtime_key: local_rate_limit_enforced
                  default_value:
                    numerator: 100
                    denominator: HUNDRED
                response_headers_to_add:
                  - append: false
                    header:
                      key: x-local-rate-limit
                      value: 'true'