Capture the Request Attributes from the request going through Istio

[Hillman]

We have followed this document to ingest Istio tracing into the Dynatrace. Configure OpenTelemetry tracing with Istio — Dynatrace Docs

I have also updated the Request Attributes rule and attempt to include "Istio", then "OpenTelemetry" into rules.

However, we have found the request captured still not able to capture any Request Attributes.

What we expect is something like this:

What can we do the achieve that?

[PacoPorro]

AFAIK 

When ingesting Istio traces via OpenTelemetry, Dynatrace Request Attributes are not applied because these traces are not associated with OneAgent‑detected process groups. Request Attributes only work on requests ingested by oneagent.
Check if you can find the span attribute here.

[Hillman]

We do have some custom attributes we want to capture from the requests. Does it mean we have to use "Span capturing" instead to capture them?