private void ensureGroundingSupportsIsMutable() {
      if (!((bitField0_ & 0x00000008) != 0)) {
        groundingSupports_ =
            new java.util.ArrayList<com.google.cloud.vertexai.api.GroundingSupport>(
                groundingSupports_);
        bitField0_ |= 0x00000008;
      }
    }
<pre>
List of supporting references retrieved from specified grounding source.
</pre>

<code>repeated .google.cloud.vertexai.v1.GroundingChunk grounding_chunks = 5;</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GroundingMetadata.java