docs: public ListSpeechSynthesisTasksResult withSynthesisTasks(SynthesisTask... synthesisTasks) {
          if (this.synthesisTasks == null) {
              setSynthesisTasks(new java.util.ArrayList<SynthesisTask>(synthesisTasks.length));
          }
          for (SynthesisTask ele : synthesisTasks) {
              this.synthesisTasks.add(ele);
          }
          return this;
      }