How to auto populate the watchlist members of a case on the ui page reference field

[Vedika29]

I want to populate the watchlist members to be populated on the the UI page which has the field contact type reference to sys_user table

[Saiganeshraja]

  <g:ui_reference name="user" id="user" table="sys_user" query="" completer="AJAXTableCompleter" ng-model="user"/>

use above tag in UI script.

[Vedika29]

I have tried it but it is displaying the all users from user table instead of watchlist members who are selected on case form