Hi,
I’m following Custom operators  |  TensorFlow Lite 3 to create a custom operator (to use it on a micocontroller) which can be supported by Tensorflow Lite. For the sine operator the tutorial uses
converter = tf.lite.TFLiteConverter.from_concrete_functions([sin.get_concrete_function(x)])
converter.allow_custom_ops = True
tflite_model = converter.convert()

Does this snippet of code allow you to convert the entire model which uses sine op, right?