public com.google.protobuf.Value.Builder getInstancesBuilder(int index) {
      return getInstancesFieldBuilder().getBuilder(index);
    }
<pre>
Optional. The instances that are the input to token counting call.
Schema is identical to the prediction schema of the underlying model.
</pre>

<code>
repeated .google.protobuf.Value instances = 2 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/CountTokensRequest.java