HERE API Autosuggest Geocoding search

Question

I am looking to use the HERE Geocoding Autosuggest. I understand how the API works and it is the implementation in Flutter I seek guidance on.

There is a Javascript example for the previous version

    https://developer.here.com/documentation/examples/rest/geocoding_suggestions 

This demonstrates the call and Json return, but I wondered if there were any Flutter examples/ guidance on implementation when it comes to displaying the data.

For example, the API returns address results for 'London', does Flutter have build in functionality to display these to the user (Such as TypeAheadField), in a dropdown style box below entry field for example, like the HERE screenshot below, where the user can select the correct suggestion? How would the call be implemented with this function?

I presume I will utilise an onChanged/SetState style function to call and display, but it is how to make the call as user types and then display the returned suggestion that I would find an example useful.

Any resources/ tips welcome

Thank you