custom picker to auto complete with Appian users?

Hello All!

I'm trying to figure out the best way to autocomplete a field with an Appian user name?

For Example 

I start typing persons surname:

Smi

An auto complete suggests:

Smith Jon
Smith Dan 

Etc etc 

The idea here is an "Admin" will log into this start typing the users last name or first name etc and have Appian give suggestions which the user can then select one of this will then be used as a variable to confirm groups user is a member of so we can add or remove access to other groups.

As always any help is appreciated thank you! :) 

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