In order to do an inference using a model, you need to preprocess the input to tensor using tokenizer. Currently, there isn't viable tokenizer available in dart ecosystem which make this library practically useless for most beginner.
Unless you want to write your own tokenizer, don't waste your time searching the example to use this library. Alternatively, you can go back to python or javascript who has well known tokenizer like the one maintained by HuggingFace: