To provide an option that allows searching for users, you can create a class that implements UserContactsInterface.php from the package and define the getUserContacts function.
The return type of the getUserContacts function should be a string containing a JSON representation of an array of objects. Each object denoting a user must have an "email" attribute as shown below:
For example, you can create a class called SendUserContacts which implements UserContactsInterface and performs an operation to get users in the getUserContacts function:
In sharedo.config file set the "typehead" key to the SendUserContacts class path: