WAB Query Widget programmatically change dropdown list

[AleksandarStefanovski]

Hello,

I want to programmatically change the dropdown list under the WAB Query Widget to return data only for the currently signed in - user.

As displayed in the first picture, once I click on the Query widget, a list of layers appear, once I select one of these layers, for example the first one - 

A form of dropdown lists appears, now on the first dropdown list I want to retrieve only the currently signed in "Operator (Оператор)" for example "akton.dooel", the rest of the dropdown list items should not appear.
Any ideas on how can I make this possible?

Thank you,

Alesksandar