It seems likely that substring search in annotation labels using the `in` operator is not directly supported in the Phoenix dashboard. According to the <https://docs.arize.com/phoenix/tracing/how-to-tracing/importing-and-exporting-traces/extract-data-from-spans#%3AR5cd9uucqfkvfa%3A|Phoenix documentation>, the `where()` method in `SpanQuery` allows for filtering using Python boolean expressions, but function/method calls are generally disallowed, which might include substring searches.
Would you like more detail on possible workarounds or further assistance?
Sources:
- <https://docs.arize.com/phoenix/tracing/how-to-tracing/importing-and-exporting-traces/extract-data-from-spans#%3AR5cd9uucqfkvfa%3A|Phoenix documentation>
