Hi! Just to make sure I understand the question correctly: You want to have a free-form input that also has a dropdown/typeahead with options? For example, like this: W3Schools Tryit Editor
It's not currently built in – although it's a nice idea, especially adding it to the input as a datalist – I'll test this as a new feature In the meantime, you could add this as a custom HTML block as an
<input>
with a <datalist>
and add custom JavaScript that calls window.prodigy.update({ user_input: input.value })
to update the current task with whatever the user has typed in.