Linking traces to log entries

I'm running a Golang HTTP server on K8s using OpenCensus for tracing. In my logs I set the JSON field `trace` to `"projects/$PROJECT/traces/$TRACE_ID"`.

If I click on the "Log" link in a Stackdriver trace (see screenshot) I end up with zero log results. However, if I manually replace `trace=...` with `jsonPayload.trace=...` the filter works and I get the log entries associated with the trace I clicked on.

Is there anything I can do to make this work automatically? Ie. is there any way to set the `trace` field directly instead of just the `jsonPayload.trace`?