How to remove selected default tracing tags?

Hi, the zipkin traces emitted via the istio sidecar have fields like request_size and response_size as tags by default. Two questions:

  1. Can someone help with how we can remove certain tags from traces using the Telemetry API and if it’s possible. I could find examples only for adding custom fields.
  2. We are seeing that having fields like the above as tags can really load the backend. Should we be even adding these as tags by default?