Do we have any how to articles on AutoCompelete field?
You can have a look at this KB question.
I'm not an expert in implementation, but I believe that it works the same way as dynamic radio buttons, or dynamic drop down lists. Try looking there first:
Getting Started with Data Driven Components
More info here:
How to use Data-Driven Components in Maestro
How to update a Data-Driven Dropdown triggered by an input Text Field
... and this one is fairly new, which I haven't tried yet: