public com.google.protobuf.ByteString getPpeSupercategoryLabelStringBytes() {
        java.lang.Object ref = ppeSupercategoryLabelString_;
        if (ref instanceof String) {
          com.google.protobuf.ByteString b =
              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
          ppeSupercategoryLabelString_ = b;
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
      }
<pre>
Human readable string of the super category label (Examples: head_cover,
hands_cover, face_cover).
</pre>

<code>string ppe_supercategory_label_string = 3;</code>

@return The bytes for ppeSupercategoryLabelString.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/PersonalProtectiveEquipmentDetectionOutput.java