Can you try using TFLite Task Library for TF.js to run the TFLite model, instead of trying to convert the SavedModel to TF.js. There are ops used in the model that aren’t supported natively in TF.js.
Please follow the example below.
  
      

      js.tensorflow.org
  

  
    

TensorFlow.js 1

  A WebGL accelerated, browser based JavaScript library for training and deploying ML models